Astronomy:HD 3240
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 36m 08.30992s[1] |
| Declination | +54° 10′ 06.4147″[1] |
| Apparent magnitude (V) | 5.08[2] |
| Characteristics | |
| Spectral type | B7 III[3] |
| B−V color index | −0.098±0.003[2] |
| Variable type | constant[4] |
| Astrometry | |
| Radial velocity (Rv) | +1.1±2.8[2] km/s |
| Proper motion (μ) | RA: +23.133[1] mas/yr Dec.: −1.584[1] mas/yr |
| Parallax (π) | 6.8287 ± 0.1447[1] mas |
| Distance | 480 ± 10 ly (146 ± 3 pc) |
| Absolute magnitude (MV) | −1.03[3] |
| Details | |
| Mass | 3.91±0.08[5] M☉ |
| Luminosity | 405+43 −39[5] L☉ |
| Surface gravity (log g) | 3.696±0.016[6] cgs |
| Temperature | 11885±82[5] K |
| Rotational velocity (v sin i) | 59[5] km/s |
| Age | 201[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 3240 is a single[9] 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.[2] 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.[7]
This star has a stellar classification of B7 III,[3] matching an aging giant star that has exhausted the supply of hydrogen at its core. It is around 201[7] million years old and is spinning with a projected rotational velocity of 59 km/s,[5] well below its critical velocity of 335 km/s.[6] The star has 3.9[5] times the mass of the Sun and is radiating 405 times the Sun's luminosity from its photosphere at an effective temperature of 11,885 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 Huang, W. et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics 547: A62, doi:10.1051/0004-6361/201219804, Bibcode: 2012A&A...547A..62H.
- ↑ 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.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 6.0 6.1 Huang, W. et al. (2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal 722 (1): 605–619, doi:10.1088/0004-637X/722/1/605, Bibcode: 2010ApJ...722..605H.
- ↑ 7.0 7.1 7.2 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
- ↑ "HD 3240". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+3240.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
 |  |
