Delta Leporis
Delta Leporis (δ Leporis) is a solitary,[11] orange-hued star in the southern constellation of Lepus. It is visible to the naked eye with an apparent visual magnitude of 3.85.[2] Based upon an annual parallax shift of 28.68 mas,[1] it is 114 light years distant from Earth.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 51m 19.29613s[1] |
| Declination | −20° 52′ 44.7232″[1] |
| Apparent magnitude (V) | 3.85[2] |
| Characteristics | |
| Spectral type | K1 IV Fe−0.5[3] or K0 IIIb Fe−1.5 CH0.5[4] |
| U−B color index | +0.71[2] |
| B−V color index | +0.98[2] |
| Astrometry | |
| Radial velocity (Rv) | +100.20[5] km/s |
| Proper motion (μ) | RA: +229.49[1] mas/yr Dec.: −648.41[1] mas/yr |
| Parallax (π) | 28.68 ± 0.17 mas[1] |
| Distance | 113.7 ± 0.7 ly (34.9 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.04[6] |
| Details | |
| Mass | 0.94[6] M☉ |
| Radius | 10[7] R☉ |
| Luminosity | 45.7[6] L☉ |
| Surface gravity (log g) | 2.46±0.23[8] cgs |
| Temperature | 4,660±84[8] K |
| Metallicity [Fe/H] | −0.74±0.09[8] dex |
| Rotational velocity (v sin i) | 0[9] km/s |
| Age | 10.7[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an old, evolved K-type star with an age of about 10.7 billion years.[6] Keenan and McNeil (1989) classified it as K0 IIIb Fe−1.5 CH0.5,[4] indicating it is a giant star showing a deficiency of iron and an excess of cyanogen in its atmosphere. However, Gray et al. (2006) listed it as K1 IV Fe−0.5,[3] which would suggest a less evolved subgiant star. It may be a red clump star, which indicates it is generating energy through helium fusion at its core.[12]
The measured angular diameter of this star, after correction for limb darkening, is 2.63±0.04 mas.[13] At the estimated distance of this star, this yields a physical size of about 10 times the radius of the Sun.[7] It has only 94%[6] of the Sun's mass and is radiating 46[6] times the Sun's luminosity from its photosphere at an effective temperature of 4,660 K.[8]
References
- ^ a b c d e f van Leeuwen, F. (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.
- ^ a b c d Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues, 2237, Bibcode:2002yCat.2237....0D.
- ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ a b c d e f g Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166.
- ^ a b 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:
- ^ a b c d Sharma, Kaushal; et al. (2016), "New atmospheric parameters and spectral interpolator for the MILES cool stars", Astronomy & Astrophysics, 585: 27, arXiv:1512.04882, Bibcode:2016A&A...585A..64S, doi:10.1051/0004-6361/201526111, S2CID 118576178, A64.
- ^ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
- ^ "del Lep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-18.
{{cite web}}: CS1 maint: postscript (link) - ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
- ^ 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.