HD 56405
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major[1] |
| Right ascension | 07h 16m 14.55266s[2] |
| Declination | −15° 35′ 08.4862″[2] |
| Apparent magnitude (V) | 5.45[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | A1V[5] |
| B−V color index | 0.079±0.005[1] |
| Astrometry | |
| Radial velocity (Rv) | +6.30±0.9[6] km/s |
| Proper motion (μ) | RA: −45.415[2] mas/yr Dec.: −14.578[2] mas/yr |
| Parallax (π) | 12.9537±0.0714 mas[2] |
| Distance | 252 ± 1 ly (77.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.88[1] |
| Details | |
| Mass | 2.13[7] M☉ |
| Radius | 2.47[8] R☉ |
| Luminosity | 38.86[1] L☉ |
| Surface gravity (log g) | 4.14±0.14[7] cgs |
| Temperature | 9,562±325[7] K |
| Rotational velocity (v sin i) | 149[7] km/s |
| Age | 212[7] Myr |
| Other designations | |
| BD−15°1734, FK5 2561, GC 9657, GJ 9228, HD 56405, HIP 35180, HR 2758, SAO 152641, TYC 5965-363-1[9] | |
| Database references | |
| SIMBAD | data |
HD 56405 is a star in the southern constellation of Canis Major. It is white in hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.45.[3] To the east of HD 56405 is the open cluster NGC 2360, also known as Caroline's Cluster.[10] The distance to HD 56405, as determined from parallax measurements, is approximately 252 light years. It is drifting further away with a radial velocity (RV) of about +6 km/s.[6] Although classed as a single star,[11] it is to suspected to vary in RV.[12]
This is an A-type main-sequence star with a stellar classification of A1V.[5] It was classed as a candidate Lambda Boötis star,[13] but as of 2015 this classification has been rejected by astronomers due to the star having an inconsistent UV flux, possible RV variability, and a fairly high rotation rate.[3] The star is about 212 million years old with 2.13 times the mass of the Sun and is spinning with a projected rotational velocity of 149 km/s.[7] It is radiating 39[1] times the luminosity of the Sun from its photosphere at an effective temperature of around 9,562 K.[7]
References
- ^ a b c d e 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. XHIP record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c Murphy, Simon J.; et al. (October 2015). "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue". Publications of the Astronomical Society of Australia. 32: 43. arXiv:1508.03633. Bibcode:2015PASA...32...36M. doi:10.1017/pasa.2015.34. S2CID 59405545. e036.
- ^ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
- ^ a b Gontcharov, G. A. (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 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
- ^ Stassun, Keivan G.; et al. (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.
- ^ "HD 56405". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-06.
- ^ Streicher, M. (December 2005). "Deepsky Delights: Caroline Herschel's deepsky discoveries". Monthly Notes of the Astronomical Society of Southern Africa. 64 (11 and 12): 234–236. Bibcode:2005MNSSA..64..234S.
- ^ 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.
- ^ Gerbaldi, M.; et al. (December 2003). "The heterogeneous class of lambda Bootis stars". Astronomy and Astrophysics. 412 (2): 447–464. Bibcode:2003A&A...412..447G. doi:10.1051/0004-6361:20031472.
- ^ Renson, P.; et al. (December 1990). "Catalogue of Lambda Bootis Candidates". Bulletin d'Information du Centre de Données Stellaires. 38: 137. Bibcode:1990BICDS..38..137R.