XX Pyxidis

XX Pyxidis
Observation data; Epoch J2000 Equinox J2000
Constellation	Pyxis
Right ascension	08h 58m 39.04s
Declination	−24° 35′ 10.6 ″
Apparent magnitude (V)	11.49
Characteristics
Spectral type	A4V + M3V
Variable type	Delta Scuti variable
Astrometry
Proper motion (μ)	RA: -13.830 mas/yr ; Dec.: 6.985 mas/yr
Parallax (π)	1.4301 ± 0.0341 mas
Distance	2,280 ± 50 ly ; (700 ± 20 pc)
Details
Mass	1.85 ± 0.05 M☉
Other designations
	XX Pyxidis, CD-24 7599, GSC 06589-00261, 2MASS, Gaia DR2 5652782998603093632
Database references
SIMBAD	data

XX Pyxidis is a star located in the constellation Pyxis. It is one of the more-studied members of a class of stars known as Delta Scuti variables^[2]—short period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.^[4] Astronomers made more sense of its pulsations when it became clear that it is also a binary star system. The main star is a white main sequence star of spectral type A4V that is around 1.85±0.05 times as massive as the Sun. Its companion is most likely a red dwarf star of spectral type M3V, around 0.3 times as massive as the Sun. The two are very close—possibly only 3 times the diameter of the Sun between them—and orbit each other every 1.15 days. The brighter star is deformed into an egg-shape,^[2] and pulsates in several overlapping modes 26-76 times per day.^[5]

References[]

^ ^a ^b "XX Pyxidis", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 5 September 2015
^ ^a ^b ^c ^d Aerts, C.; Handler, G.; Arentoft, T.; Vandenbussche, B.; Medupe, R.; Sterken, C. (2002). "The δ Scuti star XX Pyx is an ellipsoidal variable". Monthly Notices of the Royal Astronomical Society. 333 (2): L35–L39. Bibcode:2002MNRAS.333L..35A. doi:10.1046/j.1365-8711.2002.05627.x.
^ ^a ^b ^c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
^ Templeton, Matthew (16 July 2010). "Delta Scuti and the Delta Scuti Variables". Variable Star of the Season. AAVSO (American Association of Variable Star Observers). Retrieved 5 September 2015.
^ Bedding, Timothy R.; et al. (2020), "Very regular high-frequency pulsation modes in young intermediate-mass stars", Nature, 581 (7807): 147–151, arXiv:2005.06157, doi:10.1038/s41586-020-2226-8, PMID 32405022, S2CID 218613877

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[SIMBAD-1] "XX Pyxidis", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 5 September 2015

[Aerts_2002-2] Aerts, C.; Handler, G.; Arentoft, T.; Vandenbussche, B.; Medupe, R.; Sterken, C. (2002). "The δ Scuti star XX Pyx is an ellipsoidal variable". Monthly Notices of the Royal Astronomical Society. 333 (2): L35–L39. Bibcode:2002MNRAS.333L..35A. doi:10.1046/j.1365-8711.2002.05627.x.

[EDR3-3] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.

[4] Templeton, Matthew (16 July 2010). "Delta Scuti and the Delta Scuti Variables". Variable Star of the Season. AAVSO (American Association of Variable Star Observers). Retrieved 5 September 2015.

[5] Bedding, Timothy R.; et al. (2020), "Very regular high-frequency pulsation modes in young intermediate-mass stars", Nature, 581 (7807): 147–151, arXiv:2005.06157, doi:10.1038/s41586-020-2226-8, PMID 32405022, S2CID 218613877

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