Z Chamaeleontis

From Wikipedia, the free encyclopedia
Z Chamaeleontis
ZChaLightCurve.png
A light curve for Z Chamaeleontis, adapted from Wood et al. (1986)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 08h 07m 27.7422s[2]
Declination −76° 32′ 00.6796″[2]
Apparent magnitude (V) +13.0
Characteristics
Spectral type DA / M6V
Astrometry
Proper motion (μ) RA: −33.650±0.222[2] mas/yr
Dec.: 56.883±0.239[2] mas/yr
Parallax (π)8.6625 ± 0.1235[2] mas
Distance377 ± 5 ly
(115 ± 2 pc)
Details
Mass0.7/0.12 M☉
Radius0.013/0.48 R☉
Luminosity0.007/0.017 L☉
Temperature14,700/3100 K
Orbit
Period (P)0.0002 yr
Semi-major axis (a)0.003 AU
Inclination (i)81.7°
Other designations
Z Cha, 2E 1942, SBC9 505, CSV 1244, 2MASS J08072774-7632006, SON 4893, 2E 0808.8-7622, 1RXS J080728.8-763157, AAVSO 0809-76
Database references
SIMBADdata

Z Chamaeleontis (abbreviated Z Cha) is a dwarf nova variable star system approximately 377 light-years away from the Sun, where two stars orbit each other every 1.78 hours. The system comprises an eclipsing white dwarf and red dwarf and possibly a yet unconfirmed third low-mass substellar companion.[3]

Substellar companion[]

Dai et al. (2009) invoke the presence of a third object to explain orbital period variations with an apparent periodicity of roughly 28 years. The third body could yield a minimum mass 20 times greater than Jupiter and be located 9.9 Astronomical Units away from the dwarf nova, being likely a low-mass brown dwarf.

Possible makeup of the Z Chamaeleontis Star system.
The Z Chamaeleontis planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b (unconfirmed) ≥20 MJ 9.9 28 ≤0.2 — —

See also[]

References[]

  1. ^ Wood, Janet; Horne, Keith; Berriman, Graham; Wade, R.; O'Donoghue, D.; Warner, B. (April 1986). "High-speed photometry of the dwarf nova Z Cha in quiescence". Monthly Notices of the Royal Astronomical Society. 219: 629–655. doi:10.1093/mnras/219.3.629. Retrieved 11 December 2021.
  2. ^ a b c d e 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. ^ a b Dai; Qian, Shengbang; Lajús, Eduardo FernáNdez (26 August 2009). "Evidence of a Brown Dwarf in the Eclipsing Dwarf Nova Z Chamaeleonis". The Astrophysical Journal. 703 (1): 109–113. Bibcode:2009ApJ...703..109D. doi:10.1088/0004-637X/703/1/109.

Coordinates: Sky map 08h 07m 27.75s, −76° 32′ 00.7″


Stub icon

This extrasolar-planet-related article is a stub. You can help Wikipedia by .

  • v
  • t
Stub icon

This binary or multiple star system–related article is a stub. You can help Wikipedia by .

  • v
  • t
Stub icon

This variable star–related article is a stub. You can help Wikipedia by .

  • v
  • t
Stub icon

This article about a white dwarf is a stub. You can help Wikipedia by .

  • v
  • t
Retrieved from ""