AD Phoenicis

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AD Phoenicis
ADPheLightCurve.png
A light curve for AD Phoenicis, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Phoenix
Right ascension 01h 16m 38.07s [2]
Declination −39° 42 31.33 [2]
Apparent magnitude  (V)10.27 – 10.80 [3]
Characteristics
Evolutionary stage F9/G0V [4]
B−V color index 0.56 [4]
Variable type W UMa [3]
Astrometry
Radial velocity (Rv)28.87 ± 1.47 [4]  km/s
Proper motion (μ)RA: −3.24 [2]   mas/yr
Dec.: +23.04 [2]   mas/yr
Parallax (π)4.9818 ± 0.0311  mas [2]
Distance 655 ± 4  ly
(201 ± 1  pc)
Orbit
Period (P)0.37992361 days [5]
Semi-major axis (a)2.46 R [5]
Inclination (i)76.92 ± 0.06 [5] °
Semi-amplitude (K1)
(primary)
89.04±3.10 [4] km/s
Semi-amplitude (K2)
(secondary)
242.41±1.42 [4] km/s
Details
Primary
Mass 1.004 [5]   M
Radius 1.17 [5]   R
Luminosity 1.476 [6]   L
Temperature 6,155 [5]   K
Secondary
Mass 0.378 [5]   M
Radius 0.76 [5]   R
Luminosity0.706 [6]   L
Temperature 5,835 [5]   K
Other designations
AD Phe, CD−40°288, HIP  5955 [7]
Database references
SIMBAD data

AD Phoenicis is a variable star in the constellation of Phoenix. An eclipsing binary, its apparent magnitude has a maximum of 10.27, dimming to 10.80 during primary and secondary eclipses, which are approximately equal. [3] From parallax measurements by the Gaia spacecraft, the system is located at a distance of 655 light-years (201 parsecs ) from Earth. [2]

AD Phoenicis is a contact binary of W Ursae Majoris type, composed of two stars so close that their surfaces touch each other. They are separated by 2.46 solar radii and orbit each other with a period of 0.3799 days. The primary star has a mass of 1.00 solar mass and a radius of 1.17 solar radii, while the secondary has 0.38 solar masses and 0.76 solar radii. Their surface temperatures are very similar, 6,155 and 5,835  K, which is the reason for the eclipses being equal-depth. [5]

In visible light, the primary star contributes 71.2% of the system's luminosity, while the secondary contributes the rest (28.8%). [5] Previous analyses of the system suggested that the secondary star was eclipsed during the primary minimum and hence was hotter than the primary. [6] The bolometric luminosity of the two stars combined is 2.298 L. [2] The eclipse's light curve shows an asymmetric feature that is best explained by a large starspot in the surface of the primary, about 700 K cooler than the rest of the photosphere. Asymmetry in the light curve may also be caused by starspots on one or both components, which would result in slightly results for the physical properties of the two stars. [5]

Variations in the orbital period of the system have been detected, which were modelled as a continuous decrease in the period plus a cyclic oscillation. The period decrease of about 1.5×10−7 days per year is likely caused by mass transfer from the secondary to the primary star, while the oscillation can be explained by a third star in the system or by a magnetic activity cycle. In the third star hypothesis, its orbit would have a period of 56.2 ± 0.9 years and an eccentricity of 0.36 ± 0.01. A minimum mass of 0.257 solar masses is calculated, which corresponds to a red dwarf of spectral type M4–M5, consistent with the lack of photometric and spectroscopic evidence for this star. [5]

Related Research Articles

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<span class="mw-page-title-main">W Ursae Majoris</span> Star in the constellation Ursa Major

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<span class="mw-page-title-main">Alpha Phoenicis</span> Orange-hued star in the constellation Phoenix

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<span class="mw-page-title-main">Gamma Persei</span> Binary star system in the constellation Perseus

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<span class="mw-page-title-main">V1472 Aquilae</span> Binary star system in the constellation Aquila

V1472 Aquilae is a triple star system in the equatorial constellation of Aquila. It is a variable star that ranges in brightness from 6.36 down to 6.60. The system is located at a distance of approximately 780 light years from the Sun based on parallax. It is a high-velocity star system with a radial velocity of −112 km/s.

<span class="mw-page-title-main">SX Phoenicis</span>

SX Phoenicis is a variable star in the southern constellation Phoenix. With an apparent visual magnitude ranging around 7.33, it is too faint to be readily seen with the naked eye and requires binoculars. It is located 272 light years from the Sun, as determined from an annual parallax shift of 12 mas.

<span class="mw-page-title-main">Gamma Phoenicis</span> Binary star in the constellation Phoenix

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Chi<sup>2</sup> Hydrae Binary star system in the constellation Hydra

Chi2 Hydrae, Latinised from χ2 Hydrae, is a binary star system in the equatorial constellation of Hydra. Based upon an annual parallax shift of 4.6 mas as seen from Earth, it is located roughly 685 light years from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of about 5.7.

Phi Phoenicis, Latinized from φ Phoenicis, is a binary star system in the southern constellation of Phoenix. It is faintly visible to the naked eye with an apparent visual magnitude of 5.1. Based upon an annual parallax shift of 10.185 mas as seen from Earth, it is located approximately 320 light years from the Sun. It is moving away with a heliocentric radial velocity of 10.4 km/s.

<span class="mw-page-title-main">Xi Phoenicis</span> Binary star in the constellation Phoenix

Xi Phoenicis, Latinized from ξ Phoenicis, is a visual binary star system in the southern constellation of Phoenix. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.70. Based upon an annual parallax shift of 14.61 mas as measured from Earth, it is located around 223 light years from the Sun. The system is moving away from the Sun with a radial velocity of about +10 km/s.

<span class="mw-page-title-main">SV Centauri</span> Star in the constellation Centaurus

SV Centauri is a variable star in the constellation Centaurus. An eclipsing binary, its visual apparent magnitude has a maximum of 8.71, fading to 9.98 during primary eclipse and 9.42 during secondary eclipse. From its brightness, it's estimated to be around 6,000 light-years away from Earth. Parallax measurements from Gaia Data Release 2 yield a similar distance of around 2,100 pc.

<span class="mw-page-title-main">AE Phoenicis</span> Star in the constellation Phoenix

AE Phoenicis is a variable star in the constellation of Phoenix. An eclipsing binary, its apparent magnitude has a maximum of 7.56, dimming to 8.25 during primary eclipse and 8.19 during secondary eclipse. From parallax measurements by the Gaia spacecraft, the system is located at a distance of 168 light-years from Earth.

<span class="mw-page-title-main">BD Phoenicis</span> Variable star in the constellation of Phoenix

BD Phoenicis is a variable star in the constellation of Phoenix. From parallax measurements by the Gaia spacecraft, it is located at a distance of 256 light-years from Earth. Its absolute magnitude is calculated at 1.5.

<span class="mw-page-title-main">AI Phoenicis</span> Star in the constellation Phoenix

AI Phoenicis is a variable star in the constellation of Phoenix. An Algol-type eclipsing binary, its apparent magnitude is constant at 8.58 for most of the time, sharply dropping to 9.35 during primary eclipse and to 8.89 during secondary eclipse. The system's variability was discovered by W. Strohmeier in 1972. From parallax measurements by the Gaia spacecraft, the system is located at a distance of 560 light-years from Earth, in agreement with earlier estimates based on its luminosity.

<span class="mw-page-title-main">V752 Centauri</span> Star in the constellation Centaurus

V752 Centauri is multiple star system and variable star in the constellation of Centaurus. An eclipsing binary, its apparent magnitude has a maximum of 9.10, dimming to 9.66 during primary eclipse and 9.61 during secondary eclipse. Its variability was discovered by Howard Bond in 1970. From parallax measurements by the Gaia spacecraft, the system is located at a distance of 410 light-years from Earth.

<span class="mw-page-title-main">DY Pegasi</span> Star in the constellation Pegasus

DY Pegasi, abbreviated DY Peg, is a binary star system in the northern constellation of Pegasus. It is a well-studied SX Phoenicis variable star with a brightness that ranges from an apparent visual magnitude of 9.95 down to 10.62 with a period of 1.75 hours. This system is much too faint to be seen with the naked eye, but can be viewed with large binoculars or a telescope. Based on its high space motion and low abundances of heavier elements, it is a population II star system.

<span class="mw-page-title-main">XY Ursae Majoris</span> Eclipsing binary star system in the constellation of Ursa Major

XY Ursae Majoris is a short period binary star system in the northern circumpolar constellation of Ursa Major. It is an eclipsing binary with a baseline apparent visual magnitude of 9.50. The system is located at a distance of 221.5 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −10 km/s. It has a relatively high proper motion, traversing the celestial sphere at the angular rate of 0.191″·yr−1.

<span class="mw-page-title-main">V346 Centauri</span>

V346 Centauri is a variable star in the constellation Centaurus. An Algol-type eclipsing binary, its apparent magnitude has a maximum of 8.50, dropping to 8.77 during primary eclipse and to 8.72 during secondary eclipse, the latter being a total eclipse. From parallax measurements by the Gaia spacecraft, the system is located at a distance of about 2300 parsecs (7400 light-years), which is consistent with earlier estimates, based on its luminosity, of 2380 parsecs. The system is a confirmed member of the open cluster Stock 14, which contains many other young OB stars.

<span class="mw-page-title-main">BH Virginis</span> Eclipsing binary star in the constellation Virgo

BH Virginis is a binary star system in the equatorial constellation of Virgo. With a typical apparent visual magnitude of 9.6, it is too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 488 light years from the Sun. The system is drifting closer with a net radial velocity of −23 km/s.

<span class="mw-page-title-main">RS Sagittarii</span> Eclipsing binary star system in the constellation Sagittarius

RS Sagittarii is an eclipsing binary star system in the southern constellation of Sagittarius, abbreviated RS Sgr. It is a double-lined spectroscopic binary with an orbital period of 2.416 days, indicating that the components are too close to each other to be individually resolved. The system has a combined apparent visual magnitude of 6.01, which is bright enough to be faintly visible to the naked eye. During the primary eclipse the brightness drops to magnitude 6.97, while the secondary eclipse is of magnitude 6.28. The distance to this system is approximately 1,420 light years based on parallax measurements.

References

  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 7 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 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.
  4. 1 2 3 4 5 Duerbeck, Hilmar W.; Rucinski, Slavek M. (2007), "Radial Velocity Studies of Southern Close Binary Stars. II. Spring/Summer Systems", The Astronomical Journal, 133 (1): 169–176, arXiv: astro-ph/0607308 , Bibcode:2007AJ....133..169D, doi:10.1086/509764, S2CID   14454689
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 Pi, Qing-Feng; Zhang, Li-yun; Bi, Shao-lan; Han, Xianming L.; Wang, Dai-mei; Lu, Hong-Peng (2017). "Magnetic Activity and Period Variation Studies of the Short-period Eclipsing Binaries. II. V1101 Her, AD Phe, and NSV 455 (J011636.15-394955.7)". The Astronomical Journal. 154 (6): 260. Bibcode:2017AJ....154..260P. doi: 10.3847/1538-3881/aa9438 .
  6. 1 2 3 Deb, Sukanta; Singh, Harinder P. (2011). "Physical parameters of 62 eclipsing binary stars using the All Sky Automated Survey-3 data - I". Monthly Notices of the Royal Astronomical Society. 412 (3): 1787. arXiv: 1011.2574 . Bibcode:2011MNRAS.412.1787D. doi: 10.1111/j.1365-2966.2010.18016.x . S2CID   118240946.
  7. "AD Phe". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 24 January 2019.