The star is similar to the Sun, being only slightly larger and brighter in absolute magnitude. It has a stellar classification of G0 V,[3] compared to G2 V for the Sun. The effective temperature of the outer envelope is 5,936 K,[9] giving it a yellow hue of a G-type star.[14] In terms of age it is younger than the Sun, being about 3 billion years old.[12]
Observations of short term variations in the chromatic activity suggest that the star undergoes differential rotation,[15] with a rotation period of about 11–13 days.[11] Its surface has a measured activity cycle of 16.6 years, compared to 11 years on the Sun. It may also have a secondary activity cycle of 9.6 years.[16] At one time it was thought that this star might have a spectroscopic companion. However, this was ruled out by means of more accurate radial velocity measurements. No planets have yet been detected around it, and there is no evidence of a dusty disk.
The habitable zone for this star, defined as the locations where liquid water could be present on an Earth-like planet, is 0.918–1.96 AU, where 1 AU is the average distance from the Earth to the Sun.[17]
^ abvan Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600 Note: see VizieR catalogue I/311.
^ abcJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
^ abGray, R. O.; Napier, M. G.; Winkler, L. I. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956
^ abcMallik, Sushma V. (October 1998). "Chromospheric activity in cool stars and the lithium abundance". Astronomy and Astrophysics. 338: 623–636. Bibcode:1998A&A...338..623M.
^Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
^ abcBrown, 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.
^Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
^Takeda, G.; et al. (2007). "Stellar parameters of nearby cool stars. II. Physical properties of ~1000 cool stars from the SPOCS catalog". Astrophysical Journal Supplement Series. 168 (2): 297–318. arXiv:astro-ph/0607235. Bibcode:2007ApJS..168..297T. doi:10.1086/509763. S2CID 18775378. Note: see VizieR catalogue J/ApJS/168/297.
^ abcdBoyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal, 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101, S2CID 18993744. See Table 10.
^ Brandenburg, Axel; et al. (August 2017), "Evolution of Co-existing Long and Short Period Stellar Activity Cycles", The Astrophysical Journal, 845 (1): 79, arXiv:1704.09009, Bibcode:2017ApJ...845...79B, doi:10.3847/1538-4357/aa7cfa
^ abGray, David F.; Baliunas, Sallie L. (January 1997), "The Rotation of the G0 Dwarf beta Comae", Astrophysical Journal, 475 (1): 303–312, Bibcode:1997ApJ...475..303G, doi:10.1086/303522
^ abMamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. arXiv:0807.1686. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. S2CID 27151456.
^Donahue, Robert A.; Baliunas, Sallie L. (July 1992), "Evidence of differential surface rotation in the solar-type star HD 114710", Astrophysical Journal Letters, 393 (2): L63–L66, Bibcode:1992ApJ...393L..63D, doi:10.1086/186452
^Baliunas, S. L.; et al. (January 1995), "Chromospheric variations in main-sequence stars", Astrophysical Journal, Part 1, 438 (1): 269–287, Bibcode:1995ApJ...438..269B, doi:10.1086/175072 See appendix A.
^Cantrell, Justin R.; et al. (October 2013), "The Solar Neighborhood XXIX: The Habitable Real Estate of Our Nearest Stellar Neighbors", The Astronomical Journal, 146 (4): 99, arXiv:1307.7038, Bibcode:2013AJ....146...99C, doi:10.1088/0004-6256/146/4/99, S2CID 44208180
External linksEdit
SolStation entry
October 21, 2023
beta, comae, berenices, comae, berenices, main, sequence, dwarf, star, northern, constellation, coma, berenices, located, distance, about, light, years, parsecs, from, earth, greek, letter, beta, usually, indicates, that, star, second, highest, visual, magnitu. Beta Comae Berenices b Comae Berenices b Com is a main sequence dwarf star in the northern constellation of Coma Berenices It is located at a distance of about 29 95 light years 9 18 parsecs from Earth The Greek letter beta b usually indicates that the star has the second highest visual magnitude in the constellation However with an apparent visual magnitude of 4 3 2 this star is actually slightly brighter than a Comae Berenices It can be seen with the naked eye but may be too dim to be viewed from a built up urban area Beta Comae BerenicesLocation of b Coma Bernices upper left Observation dataEpoch J2000 Equinox J2000Constellation Coma BerenicesRight ascension 13h 11m 52 39379s 1 Declination 27 52 41 4535 1 Apparent magnitude V 4 26 2 CharacteristicsSpectral type G0 V 3 U B color index 0 08 2 B V color index 0 58 4 AstrometryRadial velocity Rv 6 1 5 km sProper motion m RA 803 372 1 370 6 mas yr Dec 882 512 0 526 6 mas yrParallax p 108 8951 0 3487 mas 6 Distance29 95 0 10 ly 9 18 0 03 pc Absolute magnitude MV 4 46 7 DetailsMass1 15 8 M Radius1 106 0 011 9 R Luminosity1 357 0 014 9 L Surface gravity log g 4 38 4 cgsTemperature5 936 33 9 KMetallicity Fe H 0 07 4 dexRotation12 3 1 1 10 daysRotational velocity v sin i 4 10 0 06 11 km sAge1 5 2 5 12 GyrOther designations43 Com b Com BD 28 2193 FK5 492 Gl 502 HD 114710 HIP 64394 HR 4983 LHS 348 LTT 13815 SAO 82706 13 Database referencesSIMBADdatab Comae Berenices in optical lightThe star is similar to the Sun being only slightly larger and brighter in absolute magnitude It has a stellar classification of G0 V 3 compared to G2 V for the Sun The effective temperature of the outer envelope is 5 936 K 9 giving it a yellow hue of a G type star 14 In terms of age it is younger than the Sun being about 3 billion years old 12 Observations of short term variations in the chromatic activity suggest that the star undergoes differential rotation 15 with a rotation period of about 11 13 days 11 Its surface has a measured activity cycle of 16 6 years compared to 11 years on the Sun It may also have a secondary activity cycle of 9 6 years 16 At one time it was thought that this star might have a spectroscopic companion However this was ruled out by means of more accurate radial velocity measurements No planets have yet been detected around it and there is no evidence of a dusty disk The habitable zone for this star defined as the locations where liquid water could be present on an Earth like planet is 0 918 1 96 AU where 1 AU is the average distance from the Earth to the Sun 17 See also EditList of star systems within 25 30 light yearsReferences Edit a b van Leeuwen Floor November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752v1 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 Note see VizieR catalogue I 311 a b c Johnson H L et al 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 99 Bibcode 1966CoLPL 4 99J a b Gray R O Napier M G Winkler L I April 2001 The Physical Basis of Luminosity Classification in the Late A F and Early G Type Stars I Precise Spectral Types for 372 Stars The Astronomical Journal 121 4 2148 2158 Bibcode 2001AJ 121 2148G doi 10 1086 319956 a b c Mallik Sushma V October 1998 Chromospheric activity in cool stars and the lithium abundance Astronomy and Astrophysics 338 623 636 Bibcode 1998A amp A 338 623M Wilson Ralph Elmer 1953 General Catalogue of Stellar Radial Velocities Carnegie Institute Washington D C Publication Washington Carnegie Institution of Washington Bibcode 1953GCRV C 0W a b c 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 Holmberg J et al July 2009 The Geneva Copenhagen survey of the solar neighbourhood III Improved distances ages and kinematics Astronomy and Astrophysics 501 3 941 947 arXiv 0811 3982 Bibcode 2009A amp A 501 941H doi 10 1051 0004 6361 200811191 S2CID 118577511 Takeda G et al 2007 Stellar parameters of nearby cool stars II Physical properties of 1000 cool stars from the SPOCS catalog Astrophysical Journal Supplement Series 168 2 297 318 arXiv astro ph 0607235 Bibcode 2007ApJS 168 297T doi 10 1086 509763 S2CID 18775378 Note see VizieR catalogue J ApJS 168 297 a b c d Boyajian Tabetha S et al February 2012 Stellar Diameters and Temperatures I Main sequence A F and G Stars The Astrophysical Journal 746 1 101 arXiv 1112 3316 Bibcode 2012ApJ 746 101B doi 10 1088 0004 637X 746 1 101 S2CID 18993744 See Table 10 Brandenburg Axel et al August 2017 Evolution of Co existing Long and Short Period Stellar Activity Cycles The Astrophysical Journal 845 1 79 arXiv 1704 09009 Bibcode 2017ApJ 845 79B doi 10 3847 1538 4357 aa7cfa a b Gray David F Baliunas Sallie L January 1997 The Rotation of the G0 Dwarf beta Comae Astrophysical Journal 475 1 303 312 Bibcode 1997ApJ 475 303G doi 10 1086 303522 a b Mamajek Eric E Hillenbrand Lynne A November 2008 Improved Age Estimation for Solar Type Dwarfs Using Activity Rotation Diagnostics The Astrophysical Journal 687 2 1264 1293 arXiv 0807 1686 Bibcode 2008ApJ 687 1264M doi 10 1086 591785 S2CID 27151456 LHS 348 High proper motion Star SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2012 02 04 The Colour of Stars Australia Telescope Outreach and Education Commonwealth Scientific and Industrial Research Organisation December 21 2004 archived from the original on 2012 03 18 retrieved 2012 01 16 Donahue Robert A Baliunas Sallie L July 1992 Evidence of differential surface rotation in the solar type star HD 114710 Astrophysical Journal Letters 393 2 L63 L66 Bibcode 1992ApJ 393L 63D doi 10 1086 186452 Baliunas S L et al January 1995 Chromospheric variations in main sequence stars Astrophysical Journal Part 1 438 1 269 287 Bibcode 1995ApJ 438 269B doi 10 1086 175072 See appendix A Cantrell Justin R et al October 2013 The Solar Neighborhood XXIX The Habitable Real Estate of Our Nearest Stellar Neighbors The Astronomical Journal 146 4 99 arXiv 1307 7038 Bibcode 2013AJ 146 99C doi 10 1088 0004 6256 146 4 99 S2CID 44208180External links EditSolStation entry Retrieved from https en wikipedia org w index php title Beta Comae Berenices amp oldid 1171594670, wikipedia, wiki, book, books, library,
