Astronomy:6 Andromedae

From HandWiki
Short description: Astrometric binary star system in the constellation Andromeda
For the galaxy, see Andromeda VI.
6 Andromedae
Location of 6 Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  23h 10m 27.241s[2]
Declination +43° 32′ 38.53″[2]
Apparent magnitude (V) 5.91[1]
Characteristics
Spectral type F5 V[3]
U−B color index −0.05[3]
B−V color index +0.450±0.004[1]
Astrometry
Radial velocity (Rv)−32.4±0.7[1] km/s
Proper motion (μ) RA: −211.689[2] mas/yr
Dec.: −144.535[2] mas/yr
Parallax (π)35.5518 ± 0.3115[2] mas
Distance91.7 ± 0.8 ly
(28.1 ± 0.2 pc)
Absolute magnitude (MV)3.71[1]
Orbit[3]
Period (P)3,373±6 d
Periastron epoch (T)53116 ± 16 MJD
Argument of periastron (ω)
(secondary)		165.2±2.0°
Semi-amplitude (K1)
(primary)		8.75±0.09 km/s
Details
Mass1.30[4] M☉
Radius1.50+0.03
−0.06[5] R☉
Luminosity3.090+0.018
−0.017[5] L☉
Surface gravity (log g)4.09±0.14[4] cgs
Temperature6,425±218[4] K
Metallicity [Fe/H]−0.19±0.03[1] dex
Rotational velocity (v sin i)18[6] km/s
Age2.91[4] Gyr
Other designations
6 And, BD+42°4592, FK5 3857, HD 218804, HIP 114430, HR 8825, SAO 52761, PPM 63896[7]
Database references
SIMBADdata

6 Andromedae is an astrometric binary star[8] system in the northern constellation of Andromeda.[1] The designation comes from the star catalogue of John Flamsteed, first published in 1712. Its apparent visual magnitude is 5.91,[1] which is just bright enough to be visible to the naked eye under good seeing conditions. Based upon an annual parallax shift of 35.6 mas as seen from Earth,[5] it is 92 light years from the Sun. It is moving closer to the Sun with a radial velocity of −32.4 km/s.[1] The system has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.272 arc seconds per annum.[9]

This is a single-lined spectroscopic binary with an orbital period of 9.2 years and an eccentricity of 0.3.[3] Some early observations of the star gave it a subgiant luminosity class and it was published in the Bright Star Catalogue as spectral class F5 IV. More modern measurements identify the visible component as an F-type main-sequence star with a stellar classification of F5 V.[3][10] The star is an estimated 2.9[4] billion years old with 1.3[4] times the mass of the Sun and 1.5[5] times the Sun's radius. It is radiating 3.1[5] times the Sun's luminosity from its photosphere at an effective temperature of around 6,425 K.[4] 6 Andromedae displays an infrared excess at a wavelength of 22 μm, which may indicate a circumstellar disk of warm dusty debris.[6]

The mass of the secondary component is roughly at or above that of the Sun. If it were a single, ordinary star, it should be readily visible as it would be just one magnitude fainter than the primary. The lack of conspicuous ultraviolet emission appears to rule out a white dwarf companion, so it may instead itself be a binary system consisting of two smaller stars having an orbital period between a week and a year.[3]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Griffin, R. F. (April 2012), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 223: HR 396, HR 7477, HR 7636, and 6 Andromedae", The Observatory 132 (2): 76−97, Bibcode: 2012Obs...132...76G. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 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.
  6. ↑ 6.0 6.1 Mizusawa, Trisha F. et al. (November 2012), "Exploring the Effects of Stellar Rotation and Wind Clearing: Debris Disks around F Stars", The Astronomical Journal 144 (5): 16, doi:10.1088/0004-6256/144/5/135, 135, Bibcode: 2012AJ....144..135M. 
  7. ↑ "6 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+And. 
  8. ↑ Frankowski, A. et al. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics 464 (1): 377–392, doi:10.1051/0004-6361:20065526, Bibcode: 2007A&A...464..377F. 
  9. ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483–1522, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L. 
  10. ↑ Skiff, B. A. (2014), "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)", VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014) 1, Bibcode: 2014yCat....1.2023S. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:6_Andromedae&oldid=4133735"