HD 56405
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 07h 16m 14.55266s |
| Declination | −15° 35′ 08.4862″ |
| Apparent magnitude (V) | 5.45 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1V |
| B−V color index | 0.079±0.005 |
| Astrometry | |
| Radial velocity (Rv) | +6.30±0.9 km/s |
| Proper motion (μ) | RA: −45.415 mas/yr Dec.: −14.578 mas/yr |
| Parallax (π) | 12.9537±0.0714 mas |
| Distance | 252 ± 1 ly (77.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.88 |
| Details | |
| Mass | 2.13 M☉ |
| Radius | 2.47 R☉ |
| Luminosity | 38.86 L☉ |
| Surface gravity (log g) | 4.14±0.14 cgs |
| Temperature | 9,562±325 K |
| Rotational velocity (v sin i) | 149 km/s |
| Age | 212 Myr |
| Other designations | |
| BD−15°1734, FK5 2561, GC 9657, GJ 9228, HD 56405, HIP 35180, HR 2758, SAO 152641, TYC 5965-363-1 | |
| 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. To the east of HD 56405 is the open cluster NGC 2360, also known as Caroline's Cluster. 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. Although classed as a single star, it is to suspected to vary in RV.
This is an A-type main-sequence star with a stellar classification of A1V. It was classed as a candidate Lambda Boötis star, 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. 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. It is radiating 39 times the luminosity of the Sun from its photosphere at an effective temperature of around 9,562 K.
References
- 1 2 3 4 5 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.
- 1 2 3 4 5 6 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.
- 1 2 3 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.
- 1 2 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.
- 1 2 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.
- 1 2 3 4 5 6 7 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.
