HD 3240
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 00h 36m 08.31020s[2] |
| Declination | +54° 10′ 06.4197″[2] |
| Apparent magnitude (V) | 5.08[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4][2] |
| Spectral type | B8IV[5] |
| B−V color index | −0.098±0.003[3] |
| Variable type | constant[6] |
| Astrometry | |
| Radial velocity (Rv) | +1.1±2.8[3] km/s |
| Proper motion (μ) | RA: +22.954[2] mas/yr Dec.: −1.905[2] mas/yr |
| Parallax (π) | 6.6398±0.0816 mas[2] |
| Distance | 491 ± 6 ly (151 ± 2 pc) |
| Absolute magnitude (MV) | −1.03[7] |
| Details | |
| Mass | 3.91±0.08[4] M☉ |
| Radius | 3.9[2] R☉ |
| Luminosity | 405+43 −39[4] L☉ |
| Surface gravity (log g) | 3.696±0.016[8] cgs |
| Temperature | 11,885±82[4] K |
| Metallicity [Fe/H] | −0.59[9] dex |
| Rotational velocity (v sin i) | 59[4] km/s |
| Age | 201[10] Myr |
| Other designations | |
| BD+53°102, GC 708, HD 3240, HIP 2854, HR 144, SAO 21551, GSC 03654-02131[11] | |
| Database references | |
| SIMBAD | data |
HD 3240 is a single[12] star in the northern constellation of Cassiopeia, positioned near Zeta Cassiopeiae. This object has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.08.[3] The distance to HD 3240 is approximately 480 light years based on parallax. At that range, the visual magnitude of the star is diminished by an extinction of 0.22 due to interstellar dust.[10]
This star has a stellar classification of B9IV,[5] matching a subgiant that has exhausted the supply of hydrogen at its core. Despite the spectral luminosity class, evolutionary models place the star on the main sequence.[4][2] It is around 201 million years old[10] and is spinning with a projected rotational velocity of 59 km/s,[4] well below its critical velocity of 335 km/s.[8] The star has 3.9 times the mass of the Sun[4] and is radiating 405 times the Sun's luminosity from its photosphere at an effective temperature of 11,885 K.[4]
References
- ^ 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.
- ^ a b c d e f g h 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 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, S2CID 119257644.
- ^ a b c d e f g h i Zorec, J.; Royer, F. (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 Negueruela, I.; Simón-Díaz, S.; De Burgos, A.; Casasbuenas, A.; Beck, P. G. (2024). "The IACOB project: XII. New grid of northern standards for the spectral classification of B-type stars". Astronomy and Astrophysics. 690. arXiv:2407.04163. Bibcode:2024A&A...690A.176N. doi:10.1051/0004-6361/202449298.
- ^ Jerzykiewicz, M. (January 1993), "Three known and twenty-two new variable stars of early spectra type.", Astronomy and Astrophysics, Supplemental Series, 97: 421–434, Bibcode:1993A&AS...97..421J.
- ^ Huang, W.; et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics, 547: A62, arXiv:1210.7893, Bibcode:2012A&A...547A..62H, doi:10.1051/0004-6361/201219804, S2CID 119286159.
- ^ a b Huang, W.; et al. (2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605, S2CID 118532653.
- ^ Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024), "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost", Astronomy and Astrophysics, 691: A98, arXiv:2407.06963, Bibcode:2024A&A...691A..98K, doi:10.1051/0004-6361/202451427.
- ^ a b c Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ "HD 3240". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 30, 2007.
- ^ 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.