15 Andromedae

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15 Andromedae
V340AndLightCurve.png
A light curve for V340 Andromedae, plotted from TESS data [1]
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Andromeda
Right ascension 23h 34m 37.53652s [2]
Declination +40° 14′ 11.1795″ [2]
Apparent magnitude  (V)5.55 [3]
Characteristics
Spectral type A1 III, [4] A1 Va, [5] or kA1hA3mA0.5 Va+. [6]
U−B color index 0.08
B−V color index 0.096±0.005 [3]
Variable type δ Sct [7]
Astrometry
Radial velocity (Rv)13.1±0.6 [3]  km/s
Proper motion (μ)RA: -18.165  mas/yr
Dec.: −46.183 [2]   mas/yr
Parallax (π)12.9406 ± 0.0973  mas [2]
Distance 252 ± 2  ly
(77.3 ± 0.6  pc)
Absolute magnitude  (MV)+1.16±0.16 [8]
Details [4]
Mass 2.7  M☉
Luminosity 27  L☉
Surface gravity (log g)3.90±0.03 [8]   cgs
Temperature 9,225  K
Rotational velocity (v sin i)105 [8]  km/s
Age 130  Myr
Other designations
15 And, V340 And, BD+39° 5114, FK5  1616, HD  221756, HIP  116354, HR  8947, SAO  73346 [9]
Database references
SIMBAD data

15 Andromedae, abbreviated 15 And, is a single, [10] variable star [7] in the northern constellation of Andromeda. 15 Andromedae is the Flamsteed designation, while its variable star designation is V340 And. [9] Its apparent visual magnitude is 5.55, [3] which indicates it is faintly visible to the naked eye. Its estimated distance from the Earth is 252 light years, and it is moving further away with a heliocentric radial velocity of 13 km/s. [3]

Depending on the source, this star has been classified as a giant star with a stellar classification of A1 III, [4] an A-type main-sequence star with a class of A1 Va, [5] or a Lambda Boötis star with a class of kA1hA3mA0.5 Va+. [6] It is a Delta Scuti variable that changes in brightness by 0.03 magnitude. [7] Two variability cycles, with periods 0.0403 and 0.0449 days, have been observed, a common feature for Lambda Boötis stars. [11] The star is around 130 [4]  million years old and has a high rotation rate, showing a projected rotational velocity of 105 km/s. [8] It has 2.7 times the mass of the Sun and is radiating 27 times the Sun's luminosity from its photosphere at an effective temperature of 9,225 K. [4]

This system has an excess emission of infrared radiation that suggests the presence of an orbiting disk of dust at a distance of around 50  AU from the host star. [4]

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<span class="mw-page-title-main">29 Cygni</span> A-type main sequence star in the constellation Cygnus

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References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 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 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. 1 2 3 4 5 6 Wyatt, M. C.; et al. (July 2007), "Steady State Evolution of Debris Disks around A Stars", The Astrophysical Journal, 663 (1): 365–382, arXiv: astro-ph/0703608 , Bibcode:2007ApJ...663..365W, doi:10.1086/518404, S2CID   18883195
  5. 1 2 Paunzen, E.; et al. (July 2001), "A spectroscopic survey for λ Bootis stars. II. The observational data", Astronomy and Astrophysics, 373 (2): 625–632, Bibcode:2001A&A...373..625P, doi: 10.1051/0004-6361:20010630 .
  6. 1 2 Murphy, Simon J.; et al. (2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia, 32: e036, arXiv: 1508.03633 , Bibcode:2015PASA...32...36M, doi:10.1017/pasa.2015.34, ISSN   1323-3580, S2CID   59405545.
  7. 1 2 3 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.
  8. 1 2 3 4 Paunzen, E.; et al. (November 2002), "The status of Galactic field λ Bootis stars in the post-Hipparcos era", Monthly Notices of the Royal Astronomical Society, 336 (3): 1030–1042, arXiv: astro-ph/0207488 , Bibcode:2002MNRAS.336.1030P, doi:10.1046/j.1365-8711.2002.05865.x, S2CID   2389489.
  9. 1 2 "15 And". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved September 20, 2018.
  10. ↑ 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, S2CID   14878976.
  11. ↑ Dorokhova, T. N.; et al. (March 2008), "The pulsating λ Bootis star 15 Andromedae: results from a three-site photometry campaign.", Astronomy and Astrophysics, 480 (1): 187–191, Bibcode:2008A&A...480..187D, doi: 10.1051/0004-6361:20078750 .

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