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3 Aquarii

May 03, 2024

This article is about k Aquarii. It is not to be confused with κ Aquarii.

3 Aquarii (abbreviated 3 Aqr) is a variable star in the equatorial constellation of Aquarius. 3 Aquarii is the Flamsteed designation; it also bears the Bayer designation k Aquarii and the variable star designation EN Aquarii. With a mean apparent visual magnitude of 4.429,[2] it is visible to the naked eye in dark skies. It has an annual parallax shift of 5.57 milliarcseconds with a 5% margin of error,[1] which translates to a physical distance of around 590 light-years (180 parsecs) from Earth.

3 Aquarii
Location of 3 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 47m 44.23898s[1]
Declination –05° 01′ 39.7220″[1]
Apparent magnitude (V) 4.429[2]
Characteristics
Spectral type M3 III[3]
U−B color index +1.914[2]
B−V color index +1.651[2]
Variable type Lb[4]
Astrometry
Radial velocity (Rv)−22.0[5] km/s
Proper motion (μ) RA: +1.68[1] mas/yr
Dec.: −40.06[1] mas/yr
Parallax (π)5.57 ± 0.28 mas[1]
Distance590 ± 30 ly
(180 ± 9 pc)
Absolute magnitude (MV)−1.83[6]
Details
Mass1.8[7] M☉
Radius69[8] R☉
Luminosity974[8] L☉
Surface gravity (log g)0.25[9] cgs
Temperature3,933[10] K
Other designations
EN Aqr, BD–05°5378, FK5 1543, HD 198026, HIP 102624, HR 7951, SAO 144814[11]
Database references
SIMBADdata
A light curve for EN Aquarii, plotted from Hipparcos data.[12] The data were folded with the 4.57 day period reported by Koen and Eyer (2002)[13]

With a stellar classification of M3 III,[3] this is a red giant star that has exhausted the hydrogen at its core and evolved away from the main sequence of stars like the Sun. The measured angular diameter of this star, after correction for limb darkening, is 5.60±0.70 mas.[14] At the estimated distance of 3 Aquarii,[1] this yields a physical size of about 108 times the radius of the Sun.[15] The effective temperature of the outer atmosphere is 3,933 K,[16] giving this star the cool, reddish hue of an M-type star.

The apparent magnitude of 3 Aquarii varies by up to 0.06 magnitudes, which was first noted in the 1960s.[17][18] It was formally listed as a variable star in 1973, and given the variable star designation EN Aquarii.[19] It is classified as an irregular variable,[4] although detailed analysis shows multiple possible periods.[20]

Pulsation periods[20]
Period (days) 20.2 24.9 27.2 35.0 36.9 143.9 197.2
Amplitude (magnitudes) 0.020 0.038 0.027 0.021 0.024 0.022 0.027

References edit

  1. ^ a b c d e f g van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966). "A System of photometric standards". Publ. Dept. Astron. Univ. Chile. 1. Publicaciones Universidad de Chile, Department de Astronomy: 1–17. Bibcode:1966PDAUC...1....1G.
  3. ^ a b Morgan, W. W.; et al. (1973). "Spectral Classification". Annual Review of Astronomy and Astrophysics. 11: 29. Bibcode:1973ARA&A..11...29M. doi:10.1146/annurev.aa.11.090173.000333.
  4. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
  6. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  7. ^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs". Astronomy and Astrophysics. 657: 657. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. S2CID 237605138.
  8. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  9. ^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
  10. ^ Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  11. ^ "* k Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-16.
  12. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  13. ^ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. S2CID 10505995.
  14. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  15. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1.. The radius (R*) is given by:
     
  16. ^ Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
  17. ^ A. W. J. Cousins (1966). "Fabry photometry of bright southern stars". Royal Greenwich Observatory Bulletins. 122: 59. Bibcode:1966RGOB..122...59C.
  18. ^ Eggen, Olin J. (1969). "Narrow-and Broad-Band Photometry of Red Stars.IV. Population Separation in Giant Stars". The Astrophysical Journal. 158: 225. Bibcode:1969ApJ...158..225E. doi:10.1086/150186.
  19. ^ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (1973). "59th Name-List of Variable Stars". Information Bulletin on Variable Stars. 834: 1. Bibcode:1973IBVS..834....1K.
  20. ^ a b Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (December 2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–1961. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x.

External links edit

  • Image 3 Aquarii

May 03, 2024
aquarii, this, article, about, aquarii, confused, with, aquarii, abbreviated, variable, star, equatorial, constellation, aquarius, flamsteed, designation, also, bears, bayer, designation, aquarii, variable, star, designation, aquarii, with, mean, apparent, vis. This article is about k Aquarii It is not to be confused with k Aquarii 3 Aquarii abbreviated 3 Aqr is a variable star in the equatorial constellation of Aquarius 3 Aquarii is the Flamsteed designation it also bears the Bayer designation k Aquarii and the variable star designation EN Aquarii With a mean apparent visual magnitude of 4 429 2 it is visible to the naked eye in dark skies It has an annual parallax shift of 5 57 milliarcseconds with a 5 margin of error 1 which translates to a physical distance of around 590 light years 180 parsecs from Earth 3 AquariiLocation of 3 Aquarii circled Observation dataEpoch J2000 Equinox J2000 Constellation Aquarius Right ascension 20h 47m 44 23898s 1 Declination 05 01 39 7220 1 Apparent magnitude V 4 429 2 Characteristics Spectral type M3 III 3 U B color index 1 914 2 B V color index 1 651 2 Variable type Lb 4 AstrometryRadial velocity Rv 22 0 5 km sProper motion m RA 1 68 1 mas yr Dec 40 06 1 mas yrParallax p 5 57 0 28 mas 1 Distance590 30 ly 180 9 pc Absolute magnitude MV 1 83 6 DetailsMass1 8 7 M Radius69 8 R Luminosity974 8 L Surface gravity log g 0 25 9 cgsTemperature3 933 10 K Other designationsEN Aqr BD 05 5378 FK5 1543 HD 198026 HIP 102624 HR 7951 SAO 144814 11 Database referencesSIMBADdata A light curve for EN Aquarii plotted from Hipparcos data 12 The data were folded with the 4 57 day period reported by Koen and Eyer 2002 13 With a stellar classification of M3 III 3 this is a red giant star that has exhausted the hydrogen at its core and evolved away from the main sequence of stars like the Sun The measured angular diameter of this star after correction for limb darkening is 5 60 0 70 mas 14 At the estimated distance of 3 Aquarii 1 this yields a physical size of about 108 times the radius of the Sun 15 The effective temperature of the outer atmosphere is 3 933 K 16 giving this star the cool reddish hue of an M type star The apparent magnitude of 3 Aquarii varies by up to 0 06 magnitudes which was first noted in the 1960s 17 18 It was formally listed as a variable star in 1973 and given the variable star designation EN Aquarii 19 It is classified as an irregular variable 4 although detailed analysis shows multiple possible periods 20 Pulsation periods 20 Period days 20 2 24 9 27 2 35 0 36 9 143 9 197 2 Amplitude magnitudes 0 020 0 038 0 027 0 021 0 024 0 022 0 027References edit a b c d e f g van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Gutierrez Moreno Adelina et al 1966 A System of photometric standards Publ Dept Astron Univ Chile 1 Publicaciones Universidad de Chile Department de Astronomy 1 17 Bibcode 1966PDAUC 1 1G a b Morgan W W et al 1973 Spectral Classification Annual Review of Astronomy and Astrophysics 11 29 Bibcode 1973ARA amp A 11 29M doi 10 1146 annurev aa 11 090173 000333 a b Samus N N Durlevich O V et al 2009 VizieR Online Data Catalog General Catalogue of Variable Stars Samus 2007 2013 VizieR On line Data Catalog B GCVS Originally Published in 2009yCat 102025S 1 Bibcode 2009yCat 102025S Wielen R et al 1999 Sixth Catalogue of Fundamental Stars FK6 Part I Basic fundamental stars with direct solutions Veroff Astron Rechen Inst Heidelb 35 35 Astronomisches Rechen Institut Heidelberg 1 Bibcode 1999VeARI 35 1W Anderson E Francis Ch 2012 XHIP An extended hipparcos compilation Astronomy Letters 38 5 331 arXiv 1108 4971 Bibcode 2012AstL 38 331A doi 10 1134 S1063773712050015 S2CID 119257644 Vizier catalog entry Kervella Pierre Arenou Frederic Thevenin Frederic 2022 Stellar and substellar companions from Gaia EDR3 Proper motion anomaly and resolved common proper motion pairs Astronomy and Astrophysics 657 657 arXiv 2109 10912 Bibcode 2022A amp A 657A 7K doi 10 1051 0004 6361 202142146 S2CID 237605138 a b Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR McDonald I Zijlstra A A Watson R A 15 June 2017 Fundamental parameters and infrared excesses of Tycho Gaia stars Monthly Notices of the Royal Astronomical Society 471 1 770 791 arXiv 1706 02208 Bibcode 2017MNRAS 471 770M doi 10 1093 mnras stx1433 eISSN 1365 2966 ISSN 0035 8711 Stassun Keivan G et al 9 September 2019 The Revised TESS Input Catalog and Candidate Target List The Astronomical Journal 158 4 138 arXiv 1905 10694 Bibcode 2019AJ 158 138S doi 10 3847 1538 3881 ab3467 eISSN 1538 3881 hdl 1721 1 124721 S2CID 166227927 k Aqr SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2012 07 16 ftp cats more HIP cdroms cats Centre de Donnees astronomiques de Strasbourg Strasbourg astronomical Data Center Retrieved 15 October 2022 Koen Chris Eyer Laurent March 2002 New periodic variables from the Hipparcos epoch photometry Monthly Notices of the Royal Astronomical Society 331 1 45 59 arXiv astro ph 0112194 Bibcode 2002MNRAS 331 45K doi 10 1046 j 1365 8711 2002 05150 x S2CID 10505995 Richichi A et al February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 180 5 60 10 3 AU 0 0046491 AU R 216 8 R displaystyle begin aligned 2 cdot R amp frac 180 cdot 5 60 cdot 10 3 text AU 0 0046491 text AU R bigodot amp approx 216 8 cdot R bigodot end aligned nbsp Soubiran C et al June 2010 The PASTEL catalogue of stellar parameters Astronomy and Astrophysics 515 A111 arXiv 1004 1069 Bibcode 2010A amp A 515A 111S doi 10 1051 0004 6361 201014247 S2CID 118362423 A W J Cousins 1966 Fabry photometry of bright southern stars Royal Greenwich Observatory Bulletins 122 59 Bibcode 1966RGOB 122 59C Eggen Olin J 1969 Narrow and Broad Band Photometry of Red Stars IV Population Separation in Giant Stars The Astrophysical Journal 158 225 Bibcode 1969ApJ 158 225E doi 10 1086 150186 Kukarkin B V Kholopov P N Kukarkina N P Perova N B 1973 59th Name List of Variable Stars Information Bulletin on Variable Stars 834 1 Bibcode 1973IBVS 834 1K a b Tabur V Bedding T R Kiss L L Moon T T Szeidl B Kjeldsen H December 2009 Long term photometry and periods for 261 nearby pulsating M giants Monthly Notices of the Royal Astronomical Society 400 4 1945 1961 arXiv 0908 3228 Bibcode 2009MNRAS 400 1945T doi 10 1111 j 1365 2966 2009 15588 x External links editImage 3 Aquarii Retrieved from https en wikipedia org w index php title 3 Aquarii amp oldid 1170096120, wikipedia, wiki, book, books, library,

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