Y Cygni

Last updated
Y Cyg
YCygLightCurve.png
A light curve for Y Cygni, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Cygnus
Right ascension 20h 52m 3.57718s [2]
Declination +34° 39′ 27.4861″ [2]
Apparent magnitude  (V)7.3 - 7.9 [3]
Characteristics
Primary
Spectral type O9.5V [4]
Apparent magnitude  (U)5.91[ citation needed ]
Apparent magnitude  (B)6.996[ citation needed ]
Apparent magnitude  (V)7.287 [4]
U−B color index −1.086 [4]
B−V color index −0.291 [4]
Secondary
Spectral type O9.5V [4]
Apparent magnitude  (U)5.883[ citation needed ]
Apparent magnitude  (B)6.974[ citation needed ]
Apparent magnitude  (V)7.265 [4]
U−B color index −1.091 [4]
B−V color index −0.291 [4]
Variable type Algol [3]
Astrometry
Proper motion (μ)RA: +2.763 [2]   mas/yr
Dec.: −15.981 [2]   mas/yr
Parallax (π)0.6759 ± 0.0338  mas [2]
Distance 4,900  ly
(1,500 [4]   pc)
Absolute magnitude  (MV)−3.59/−3.62 [4]
Absolute bolometric
magnitude  (Mbol)		−6.65±0.04/−6.7±0.04 [4]
Orbit [4]
PrimaryY Cyg A
CompanionY Cyg B
Period (P)2.99633210±0.00000031  d
Semi-major axis (a)28.72 R☉
Eccentricity (e)0.14508
Inclination (i)86.474±0.019°
Periastron epoch (T)2,446,308.66407±0.0001
Argument of periastron (ω)
(secondary)		312.514°
Argument of periastron (ω)
(primary)		132.514±0.052°
Details [4]
Primary
Mass 17.72±0.35  M☉
Radius 5.785±0.091  R☉
Luminosity 36,000  L☉
Surface gravity (log g)4.161±0.014  cgs
Temperature 33,200±200  K
Rotational velocity (v sin i)132 km/s
Age 2  Myr
Secondary
Mass 17.73±0.3  M☉
Radius 5.816±0.063  R☉
Luminosity37,700  L☉
Surface gravity (log g)4.157±0.01  cgs
Temperature 33,521±40  K
Rotational velocity (v sin i)132 km/s
Age 2  Myr
Other designations
Y Cyg, HD 198846, HIP 102999
Database references
SIMBAD data

Y Cygni is an eclipsing and double-lined spectroscopic binary star system in the constellation of Cygnus. It is located about 4,900 light-years from Earth. The system was one of the first binaries with a convincing detection of the apsidal precession. [4]

The two stars, being O-type main-sequence stars, orbit each other with a period of nearly 3 days. [4]

Observation history

The early type of Y Cyg made it a popular target for astronomers in the past, and spectroscopic orbits have been historically computed numerous times. [5] The first of these studies was published in 1920 by John Stanley Plaskett. [6] Extensive spectroscopic studies of Y Cyg were carried out as early as 1930. [7] Several follow-ups to these have been published in 1959, [8] 1971, [9] [10] and 1980. [11] The latter of these contained an estimate of the period of apsidal precession.

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References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  3. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Harmanec, P.; Holmgren, D. E.; Wolf, M.; Božić, H.; Guinan, E. F.; Kang, Y. W.; Mayer, P.; McCook, G. P.; Nemravová, J.; Yang, S.; Šlechta, M.; Ruždjak, D.; Sudar, D.; Svoboda, P. (March 2014). "Revised physical elements of the astrophysically important O9.5+O9.5V eclipsing binary system Y Cygni". Astronomy and Astrophysics . 563: A120. arXiv: 1403.0721 . Bibcode:2014A&A...563A.120H. doi:10.1051/0004-6361/201323230. ISSN   0004-6361. S2CID   118651473.
  5. ↑ Hill, G.; Holmgren, D. E. (May 1995). "Studies of early-type variable stars. IX. Y Cygni". Astronomy and Astrophysics. 297: 127–134. Bibcode:1995A&A...297..127H.
  6. ↑ Jones, Harold Spencer (1 November 1942). "John Stanley Plaskett, 1865-1941". The Royal Society. 4 (11): 67–82. doi: 10.1098/rsbm.1942.0007 .
  7. ↑ Redman, R. O. (August 1930). "Y Cygni". The Astronomical Society of the Pacific. 42: 250. Bibcode:1930PASP...42..250R. doi: 10.1086/124047 . S2CID   250785748.
  8. ↑ Struve, O.; Sahade, J.; Zabergs, V. (January 1959). "Y Cygni". Astrophysical Journal. 129: 59. Bibcode:1959ApJ...129...59S. doi:10.1086/146595.
  9. ↑ Vitrichenko, E. A. (1971). "The improvement of the Spectroscopic orbit of Y Cyg". Società Astronomia Italiana. 43: 71. Bibcode:1972MmSAI..43...71V.
  10. ↑ Vitrichenko, E. A. (1971). "The improvement of the Spectroscopic orbit of Y Cyg". Izv. Krym. Astrofiz. Obs. 43: 71–75. Bibcode:1971IzKry..43...71V.
  11. ↑ Gimenez, A.; Costa, V. (December 1980). "Y CYG : photometry and apsidal motion". The Astronomical Society of the Pacific. 92: 782–784. Bibcode:1980PASP...92..782G. doi:10.1086/130747. S2CID   120757652.
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