HD 3240

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]

HD 3240
Observation data
Epoch J2000.0      Equinox J2000.0
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
Distance480 ± 10 ly
(146 ± 3 pc)
Absolute magnitude (MV)−1.03[3]
Details
Mass3.91±0.08[5] M☉
Luminosity405+43
−39[5] L☉
Surface gravity (log g)3.696±0.016[6] cgs
Temperature11885±82[5] K
Rotational velocity (v sin i)59[5] km/s
Age201[7] Myr
Other designations
BD+53°102, GC 708, HD 3240, HIP 2854, HR 144, SAO 21551, GSC 03654-02131[8]
Database references
SIMBADdata

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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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.
  3. 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.
  4. 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. 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.
  6. 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.
  7. 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.
  8. "HD 3240". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 30, 2007.
  9. 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.
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