GP Andromedae

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GP Andromedae
GPAndLightCurve.png
The visual band light curve of GP Andromedae, shown over one pulsation cycle, adapted from Szeidl et al. [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 00h 55m 18.1501s [2]
Declination +23° 09′ 49.3715″ [2]
Apparent magnitude  (V)10.7 variable [3]
Characteristics
Spectral type A3 [4]
Apparent magnitude  (B)10.96 [5]
Apparent magnitude  (G)10.8282 [2]
Apparent magnitude  (J)10.071 [6]
Apparent magnitude  (H)10.018 [6]
Apparent magnitude  (K)9.993 [6]
B−V color index 0.164 [5]
Variable type Delta Scuti [4]
Astrometry
Proper motion (μ)RA: 25.77±3.38 [2]   mas/yr
Dec.: −0.37±2.58 [2]   mas/yr
Parallax (π)1.9355 ± 0.1468  mas [2]
Distance 1,700 ± 100  ly
(520 ± 40  pc)
Details [7]
Mass 1.7±0.1  M☉
Radius 1.72 [2]   R☉
Luminosity 9.454 [2]   L☉
Temperature 7,718 [2]   K
Age 13±3  Myr
Other designations
2MASS J00551814+2309494, HIP  4322, TYC 1739-1526-1
Database references
SIMBAD data

GP Andromedae (often abbreviated to GP And) is a Delta Scuti variable star in the constellation Andromeda. [4] It is a pulsating star, with its brightness varying with an amplitude of 0.55 magnitudes around a mean magnitude of 10.7. [3]

Contents

System

GP Andromedae is a main sequence Population I star of spectral type A3, placing it in the instability strip of the Hertzsprung-Russell diagram where Delta Scuti variables lay. [3]

A visual companion star 11 arcseconds away, named TYC 1739-1526-2, shares a common proper motion and has a similar distance (measured by parallax) as GP Andromedae. [8] There is no proof, however, that the two stars are gravitationally bound. [9]

Variability

The observed variability of GP Andromedae is typical for a Delta Scuti variable; it's a purely monoperiodic radial pulsating star with a period of 0.0787 days. The period of pulsations is slowly and continuously increasing, matching the predictions of stellar evolution models for Delta Scuti variables. [3]

Related Research Articles

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<span class="mw-page-title-main">28 Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">LN Andromedae</span> Star in the constellation Andromeda

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QV Andromedae is an Alpha2 Canum Venaticorum variable in the constellation Andromeda. Its maximum apparent visual magnitude is 6.6, so it can be seen by the naked eye under very favourable conditions. The brightness varies slightly following a periodic cycle of approximately 5.23 days.

<span class="mw-page-title-main">LQ Andromedae</span> Star in the constellation Andromeda

LQ Andromedae is a variable star in the constellation Andromeda. Its maximum apparent visual magnitude is 6.5, placing it at the limit of the visibility to the naked eye. The brightness, however, drops down to 6.66 with a periodic cycle of roughly 7.44 hours.

<span class="mw-page-title-main">AB Andromedae</span> Binary star in the Andromeda constellation

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<span class="mw-page-title-main">AR Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">BX Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">CC Andromedae</span> Star in the constellation Andromeda

CC Andromedae is a variable star in the constellation Andromeda. It is a pulsating star of the Delta Scuti type, with an apparent visual magnitude that varies between 9.19 and 9.46 with a periodicity of 3 hours.

<span class="mw-page-title-main">FF Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">GR Andromedae</span> Variable star in the constellation Andromeda

GR Andromedae is a variable star in the constellation Andromeda. Its apparent visual magnitude varies between 6.87 and 6.95 in a cycle of 518.2 days. It is classified as an α2 Canum Venaticorum variable.

<span class="mw-page-title-main">KX Andromedae</span> Spectroscopic binary star in the constellation Andromeda

KX Andromedae is a spectroscopic binary star in the constellation Andromeda. Its apparent visual magnitude varies between 6.88 and 7.28.

<span class="mw-page-title-main">LP Andromedae</span> Star in the constellation Andromeda

LP Andromedae is a carbon star in the constellation Andromeda. It is also a Mira variable whose mean apparent visual magnitude is 15.12 and has pulsations with an amplitude of 1.50 magnitudes and a period of 614 days.

<span class="mw-page-title-main">FG Virginis</span> Variable star in the constellation Virgo

FG Virginis is a well-studied variable star in the equatorial constellation of Virgo. It is a dim star, near the lower limit of visibility to the naked eye, with an apparent visual magnitude that ranges from 6.53 down to 6.58. The star is located at a distance of 273.5 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +16 km/s. Because of its position near the ecliptic, it is subject to lunar occultations.

References

  1. ↑ Szeidl, B.; Schnell, A.; Pocs, M. D. (July 2006). "The high-amplitude delta Scuti star GP Andromedae" (PDF). Information Bulletin on Variable Stars. 5718 (1): 1–4. Retrieved 9 October 2021.
  2. 1 2 3 4 5 6 7 8 9 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 . Gaia DR2 record for this source at VizieR.
  3. 1 2 3 4 Zhou, A. -Y.; Jiang, S. Y. (2011), "Period and Amplitude Variability of the High-amplitude δ Scuti Star GP Andromedae", The Astronomical Journal, 142 (4): 100, Bibcode:2011AJ....142..100Z, doi: 10.1088/0004-6256/142/4/100 .
  4. 1 2 3 GP And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2018-10-17.
  5. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
  6. 1 2 3 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  7. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883 , Bibcode:2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x .
  8. ↑ "TYC 1739-1526-2". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 7, 2018.
  9. ↑ Liakos, A.; Nirchos, P. (2017), "Catalogue and properties of δ Scuti stars in binaries", Monthly Notices of the Royal Astronomical Society, 465 (1): 1181–1200, arXiv: 1611.00200 , Bibcode:2017MNRAS.465.1181L, doi:10.1093/mnras/stw2756, S2CID   119284575.
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