9 Andromedae

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9 Andromedae
ANAndLightCurve.png
A light curve for AN Andromedae, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 23h 18m 23.32202s [2]
Declination +41° 46′ 25.2031″ [2]
Apparent magnitude  (V)5.98 [3]
Characteristics
Spectral type A7 V [4] or A7m [3]
B−V color index 0.215±0.002 [3]
Variable type β Lyr [5]
Astrometry
Radial velocity (Rv)−3.8±2.9 [3]  km/s
Proper motion (μ)RA: −10.266 [2]   mas/yr
Dec.: −9.791 [2]   mas/yr
Parallax (π)7.0976 ± 0.0544  mas [2]
Distance 460 ± 4  ly
(141 ± 1  pc)
Absolute magnitude  (MV)0.43 [3]
Orbit [6]
Period (P)3.2196 d
Eccentricity (e)0.03
Inclination (i)60.2 [7] °
Periastron epoch (T)2,436,094.876  JD
Semi-amplitude (K1)
(primary)		71.6 km/s
Details [7]
9 And A
Mass 2.48  M☉
Radius 3.51  R☉
Luminosity 49.2  L☉
Temperature 8,200  K
Rotational velocity (v sin i)81 [8]  km/s
9 And B
Mass 1.32  M☉
Luminosity17.5  L☉
Temperature 6,330  K
Other designations
9 And, AN And, BD+40° 5043, HD  219815, HIP  115065, HR  8864, SAO  52881 [9]
Database references
SIMBAD data

9 Andromedae, abbreviated 9 And by convention, is a variable binary star system in the northern constellation Andromeda. 9 Andromedae is the Flamsteed designation, while it bears the variable star designation AN Andromedae, or AN And. The maximum apparent visual magnitude of the system is 5.98, [3] which places it near the lower limit of visibility to the human eye. Based upon an annual parallax shift of 7.1  mas , [2] it is located 460  light years from the Earth.

This system was determined to be a single-lined spectroscopic binary in 1916 by American astronomer W. S. Adams, and the initial orbital elements were computed by Canadian astronomer R. K. Young in 1920. [7] The pair orbit each other with a period of 3.2196 days and an eccentricity of 0.03. [6] It is an eclipsing binary, which means the orbital plane is inclined close to the line of sight and, from the perspective of the Earth, the stars pass in front of each other, causing two partial eclipses every orbit. During the transit of the secondary in front of the primary, the visual magnitude drops to 6.16, while the eclipse of the secondary by the primary lowers the net magnitude to 6.09. [10]

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References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 16 October 2022.
  2. 1 2 3 4 5 6 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 .
  3. 1 2 3 4 5 6 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, S2CID   119257644.
  4. ↑ Hill, G.; et al. (1975), "MK Classifications of some Northern Hemisphere Binary Systems", Memoirs of the Royal Astronomical Society, 79: 131, Bibcode:1975MmRAS..79..131H.
  5. ↑ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  6. 1 2 Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv: astro-ph/0406573 , Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID   119387088.
  7. 1 2 3 Tremko, Jozef; Bakos, Gustav A. (October 1978), "A Photometric Study of the Am Binary System AN Andromedae", Journal of the Royal Astronomical Society of Canada, 72: 263, Bibcode:1978JRASC..72..263T.
  8. ↑ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv: 1201.2052 , Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID   14070763.
  9. ↑ "9 And". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved September 14, 2018.
  10. ↑ Avvakumova, E. A.; et al. (October 2013), "Eclipsing variables: Catalogue and classification", Astronomische Nachrichten, 334 (8): 860, Bibcode:2013AN....334..860A, doi:10.1002/asna.201311942, hdl: 10995/27061
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