Astronomy:HD 111031

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Short description: Double star in the constellation Corvus
HD 111031
Observation data
Equinox J2000.0]] (ICRS)
Constellation Corvus[1]
Right ascension  12h 46m 30.84207s[2]
Declination −11° 48′ 44.7902″[2]
Apparent magnitude (V) 6.87[1]
Characteristics
Evolutionary stage subgiant[2]
Spectral type G5 V[3]
B−V color index 0.695±0.001[1]
Astrometry
Radial velocity (Rv)−20.24±0.12[2] km/s
Proper motion (μ) RA: −279.627(24)[2] mas/yr
Dec.: 46.791(19)[2] mas/yr
Parallax (π)32.0310 ± 0.0219[2] mas
Distance101.83 ± 0.07 ly
(31.22 ± 0.02 pc)
Absolute magnitude (MV)4.42[1]
Orbit[4]
Semi-major axis (a)21.1±0.6 astronomical unit|AU
Eccentricity (e)0.71±0.01
Inclination (i)137+4
−3°
Longitude of the node (Ω)325+2
−1°
Argument of periastron (ω)
(secondary)		42+3
−2°
Details
HD 111031 A
Mass1.02[5] M☉
Radius1.25[5] R☉
Luminosity1.51[5] L☉
Surface gravity (log g)4.25[5] cgs
Temperature5,725[5] K
Metallicity [Fe/H]0.330±0.105[6] dex
Rotational velocity (v sin i)1.728±0.273[6] km/s
Age5.036+1.124
−1.092[6] Gyr
HD 111031 B
Mass0.129±0.003[4] M☉
Other designations
BD−11°3361, GJ 3746, HD 111031, HIP 62345, SAO 157502, LTT 4887[7]
Database references
SIMBADdata

HD 111031 (50 G. Corvi) is a double star in the southern constellation of Corvus. With an apparent visual magnitude of 6.87,[1] it is considered too faint to be readily visible to the naked eye. The distance to this star is 102 light years, but it is drifting closer to the Sun with a radial velocity of −20 km/s.[2] It has an absolute magnitude of 4.42.[1] The star has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.289 arcsec yr−1.[8]

This object is a solar analog with a stellar classification of G5 V;[3] a G-type main-sequence star like the Sun that is generating energy through core hydrogen fusion. It is around five billion years old and is chromospherically inactive,[3] with a projected rotational velocity of 1.7 km/s. The star has 1.0 times the mass and 1.25 times the radius of the Sun. It is radiating 1.5 times the Sun's luminosity from its photosphere at an effective temperature of 5,725 K.[5]

In 2020, a stellar companion was identified using high-contrast imaging. The study authors deem this most likely a K-type main-sequence star with a class of K5V, an angular separation of 1″ along a position angle (PA) of 300° corresponding to a projected separation of 30 astronomical unit|AU, and around 11–15% of the mass of the Sun.[9] An independent study published in 2021 identified a companion through speckle imaging. They propose this is a faint red dwarf with a class of M6 or later and a visual magnitude difference of 7.9 or more compared to the primary. It is located at a separation of 1.06″ along a PA of 121°, as of 2021.[10]

A 2022 study claimed the presence of a brown dwarf companion to this star based on radial velocity and astrometry observations,[11] but according to a 2023 follow-up study this was in fact a detection of the previously known stellar companion, poorly characterized due to the baseline of observations being much shorter than the companion's orbital period.[4]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Gray, R. O. et al. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal 126 (4): 2048–2059. doi:10.1086/378365. Bibcode: 2003AJ....126.2048G. 
  4. ↑ 4.0 4.1 4.2 Philipot, F. et al. (August 2023). "Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions". Astronomy & Astrophysics 678: A107. doi:10.1051/0004-6361/202346612. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  6. ↑ 6.0 6.1 6.2 Soto, M. G.; Jenkins, J. S. (2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy and Astrophysics 615: A76. doi:10.1051/0004-6361/201731533. Bibcode: 2018A&A...615A..76S. 
  7. ↑ "HD 111031". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+111031. 
  8. ↑ Luyten, W. J. (June 1995), "NLTT Catalogue", VizieR On-line Data Catalog: I/98A. Originally published in: 1979nltt.book.....L, Bibcode: 1995yCat.1098....0L 
  9. ↑ Gonzales, Erica J. et al. (April 2020), "The TRENDS High-contrast Imaging Survey. VIII. Compendium of Benchmark Objects", The Astrophysical Journal 893 (1): 27, doi:10.3847/1538-4357/ab71fb, 27, Bibcode: 2020ApJ...893...27G 
  10. ↑ Dalba, Paul A. et al. (March 2021). "Speckle Imaging Characterization of Radial Velocity Exoplanet Systems". The Astronomical Journal 161 (3): 11. doi:10.3847/1538-3881/abd6ed. 123. Bibcode: 2021AJ....161..123D. 
  11. ↑ Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F. 



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