GP Andromedae

GP Andromedae (often abbreviated to GP And) is a Delta Scuti variable star in the constellation Andromeda.[3] It is a pulsating star, with its brightness varying with an amplitude of 0.55 magnitudes around a mean magnitude of 10.7.[2]

GP Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 55m 18.1501s[1]
Declination +23° 09′ 49.3715″[1]
Apparent magnitude (V) 10.7 variable [2]
Characteristics
Spectral type A3[3]
Apparent magnitude (B) 10.96[4]
Apparent magnitude (G) 10.8282[1]
Apparent magnitude (J) 10.071[5]
Apparent magnitude (H) 10.018[5]
Apparent magnitude (K) 9.993[5]
B−V color index 0.164[4]
Variable type Delta Scuti[3]
Astrometry
Proper motion (μ) RA: 25.77±3.38[1] mas/yr
Dec.: −0.37±2.58[1] mas/yr
Parallax (π)1.9355 ± 0.1468[1] mas
Distance1,700 ± 100 ly
(520 ± 40 pc)
Details[6]
Mass1.7±0.1 M☉
Radius1.72[1] R☉
Luminosity9.454[1] L☉
Temperature7,718[1] K
Age13±3 Myr
Other designations
2MASS J00551814+2309494, HIP 4322, TYC 1739-1526-1
Database references
SIMBADdata

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.[2]

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.[7] There is no proof, however, that the two stars are gravitationally bound.[8]

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.[2]

References
  1. 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.
  2. 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.
  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.
  4. 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.
  5. Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; et al. (June 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.
  6. 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, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  7. "TYC 1739-1526-2". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 7, 2018.
  8. 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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