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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 00h 05m 09.75827s[2] |
| Declination | +45° 13′ 44.5108″[2] |
| Apparent magnitude (V) | 6.71[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[4] |
| Spectral type | A1 Vn[4] |
| B−V color index | 0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | −10.52±0.53[2] km/s |
| Proper motion (μ) | RA: −27.768(60) mas/yr[2] Dec.: −20.062(54) mas/yr[2] |
| Parallax (π) | 6.3137±0.0826 mas[2] |
| Distance | 517 ± 7 ly (158 ± 2 pc) |
| Absolute magnitude (MV) | +1.02[1] |
| Details | |
| Mass | 2.36±0.08[4] M☉ |
| Radius | 3.0[5] R☉ |
| Luminosity | 43.5+7.9 −6.7[4] L☉ |
| Surface gravity (log g) | 3.86[5] cgs |
| Temperature | 9,057+169 −185[4] K |
| Rotational velocity (v sin i) | 228[4] km/s |
| Age | 407[6] Myr |
| Other designations | |
| BD+44°4550, FK5 4009, HD 3, HIP 424, HR 1, SAO 36042, WDS J00052+4514A[7] | |
| Database references | |
| SIMBAD | data |
HD 3 is a single,[8] white-hued star in the northern constellation Andromeda. With an apparent visual magnitude of 6.71,[3] it is below the nominal brightness limit for visibility with the typical naked eye but may still be visible by some observers under ideal viewing conditions. It is also the first star indexed in the Bright Star Catalogue.[7] Based upon an annual parallax shift of 6.3137±0.0826 mas,[2] it is located roughly 517 light-years away. The star is moving closer with a heliocentric radial velocity of −11 km/s,[2] and will make perihelion in around 2.9 million years at a separation of around 351 ly (107.71 pc).[1]
The stellar classification of this star is A1 Vn,[4] indicating it is an A-type main-sequence star with "nebulous" lines due to rapid rotation. It is a Lambda Boötis candidate star, being classified as chemically-peculiar by Abt & Morrell (1995).[9] Murphy et al. (2015) list the membership likelihood as uncertain.[3] HD 3 has 2.36[4] times the mass of the Sun and about 1.9[10] times the Sun's radius. It is spinning with a projected rotational velocity of 228 km/s.[4] The star is radiating around 43.5[4] times the Sun's luminosity from its photosphere at an effective temperature of about 9,057 K.[4]
HD 3 has two visual companions. Component B is a magnitude 13.70 star at an angular separation of 16″ along a position angle (PA) of 107°, as of 2016. The third star, component C, is magnitude 10.58 and lies at a separation of 21″ along a PA of 235°, also as of 2016.[11] Gaia DR3 shows a parallax and proper motion for component C similar to that of the primary, suggesting that it may be gravitationally bound.[12]
References
[edit]- ^ a b c 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 g 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 d 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.
- ^ a b c d e f g h i j k Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b 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.
- ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
- ^ a b "HD 3". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-30.
- ^ Abt, H. A. (March 1981), "Visual multiples. VII - MK classifications", Astrophysical Journal Supplement Series, 45: 437–456, Bibcode:1981ApJS...45..437A, doi:10.1086/190719.
- ^ 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.
- ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
- ^ "BD+44 4550C". SIMBAD. Centre de données astronomiques de Strasbourg.
External links
[edit]- HD 3 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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