Astronomy:HD 91324
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 10h 31m 21.82130s[1] |
| Declination | −53° 42′ 55.7373″[1] |
| Apparent magnitude (V) | 4.89[2] |
| Characteristics | |
| Spectral type | F9V Fe-0.8 CH-0.7[3] |
| B−V color index | 0.500±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | +21.37±0.20[1] km/s |
| Proper motion (μ) | RA: −420.131[1] mas/yr Dec.: +209.450[1] mas/yr |
| Parallax (π) | 45.6124 ± 0.1682[1] mas |
| Distance | 71.5 ± 0.3 ly (21.92 ± 0.08 pc) |
| Absolute magnitude (MV) | 3.20[2] |
| Details[4] | |
| HD 91324 A | |
| Mass | 1.18 M☉ |
| Radius | 1.86±0.06 R☉ |
| Luminosity | 4.55[2] L☉ |
| Surface gravity (log g) | 3.97±0.10 cgs |
| Temperature | 6,127±70 K |
| Metallicity [Fe/H] | −0.27±0.06 dex |
| Rotational velocity (v sin i) | 8.8±0.6 km/s |
| Age | 3.52±1.08[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 91324 is a likely binary[4] star system in the southern constellation of Vela. It is visible to the naked eye with an apparent visual magnitude of 4.89.[2] The distance to HD 91324, as determined from its annual parallax shift of 45.6 mas,[1] is 71.5 light years. It is moving further from the Earth with a heliocentric radial velocity of +21 km/s.[1]
The primary, component A, is a metal-deficient[7] F-type main-sequence star with a stellar classification of F9V Fe-0.8 CH-0.7,[3] where the suffix notation indicates underabundances of iron and methine in its spectrum. It is around 3.5[5] billion years old and is spinning with a projected rotational velocity of 9 km/s. The star has 1.18 times the mass of the Sun and 1.86 times the Sun's radius.[4] It is radiating 4.55[2] times the Sun's luminosity from its photosphere at an effective temperature of 6,127 K.[4]
A faint star designated 2MASS J10313234–5338010[8] was found to be a possible companion to HD 91324 through a proper motion study combining data from the Two Micron All-Sky Survey and the WISE space telescope. The projected separation of the two components is 309″, or 6,700 astronomical unit|AU. Proper motion measurements for the two stars are almost identical making HD 91324 a likely binary star system. The photometry of 2MASS J10313234–5338010 is consistent with it being a red dwarf of spectral type M5 or M6.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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 2.4 2.5 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 Gray, R. O. et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 4.2 4.3 Fuhrmann, K. et al. (February 2017), "Multiplicity among Solar-type Stars", The Astrophysical Journal 836 (1): 23, doi:10.3847/1538-4357/836/1/139, 139, Bibcode: 2017ApJ...836..139F.
- ↑ 5.0 5.1 Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics 551: 4, doi:10.1051/0004-6361/201220364, L8, Bibcode: 2013A&A...551L...8P.
- ↑ "HD 91324". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+91324.
- ↑ da Silva, L. (July 1975), "The study of HR 3018, HD 91324 and alpha Crv and its implication for the age-abundance correlation of the neighbour stars", Astronomy and Astrophysics 41: 287–300, Bibcode: 1975A&A....41..287D.
- ↑ "2MASS J10313234-5338010". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASS+J10313234-5338010.
- ↑ Luhman, Kevin L. et al. (2012), "New M, L, and T Dwarf Companions to Nearby Stars from the Wide-field Infrared Survey Explorer", The Astrophysical Journal 760 (2): 152, doi:10.1088/0004-637X/760/2/152, Bibcode: 2012ApJ...760..152L.
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