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]

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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