Delta Leporis
  | |
| 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][7] M☉ |
| Radius | 10.01±0.43[7] R☉ |
| Luminosity | 45.7[6] L☉ |
| Surface gravity (log g) | 2.41±0.10[7] cgs |
| Temperature | 4,684±80[7] K |
| Metallicity [Fe/H] | −0.68±0.08[7] dex |
| Rotational velocity (v sin i) | 0[8] km/s |
| Age | 10.7[6] Gyr |
| Other designations | |
| δ Lep, 15 Lep, BD−20°1211, FK5 222, GC 7362, HD 39364, HIP 27654, HR 2035, SAO 170926, LHS 1792[9] | |
| Database references | |
| SIMBAD | data |
Delta Leporis which is latinized from δ Leporis is a solitary,[10] 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.
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.[11]
It has 94% of the Sun's mass, but a radius 10 times wider.[7] It is radiating 46 times the Sun's luminosity from its photosphere[6] at an effective temperature of 4,660 K.[12] It is a Population II star.[7]
References
[edit]- 1 2 3 4 5 6 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.
- 1 2 3 4 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.
- 1 2 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.
- 1 2 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.
- 1 2 3 4 5 6 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.
- 1 2 3 4 5 6 7 Fuhrmann, Klaus; Chini, Rolf (2021-03-11), "On ancient solar-type stars – II", Monthly Notices of the Royal Astronomical Society, 501 (4): 4903–4916, doi:10.1093/mnras/staa3942, ISSN 0035-8711.
- ↑ 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.
- ↑ 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.
