Y Cygni

Y Cyg
	; A light curve for Y Cygni, plotted from TESS data
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Cygnus
Right ascension	20h 52m 3.57718s
Declination	+34° 39′ 27.4861″
Apparent magnitude (V)	7.3 - 7.9
Characteristics
Primary
Spectral type	O9.5V
Apparent magnitude (U)	5.91[citation needed]
Apparent magnitude (B)	6.996[citation needed]
Apparent magnitude (V)	7.287
U−B color index	−1.086
B−V color index	−0.291
Secondary
Spectral type	O9.5V
Apparent magnitude (U)	5.883[citation needed]
Apparent magnitude (B)	6.974[citation needed]
Apparent magnitude (V)	7.265
U−B color index	−1.091
B−V color index	−0.291
Variable type	Algol
Astrometry
Proper motion (μ)	RA: +2.763 mas/yr ; Dec.: −15.981 mas/yr
Parallax (π)	0.6759 ± 0.0338 mas
Distance	4,900 ly ; (1,500 pc)
Absolute magnitude (MV)	−3.59/−3.62
Absolute bolometric; magnitude (Mbol)	−6.65±0.04/−6.7±0.04
Orbit
Primary	Y Cyg A
Companion	Y 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 periapsis (ω); (primary)	132.514±0.052°
Details
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☉
Luminosity	37,700 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

Short description: Binary star in the constellation Cygnus

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.

References

↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
↑ ^3.0 ^3.1 Samus, N. N. 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.
↑ ^4.00 ^4.01 ^4.02 ^4.03 ^4.04 ^4.05 ^4.06 ^4.07 ^4.08 ^4.09 ^4.10 ^4.11 ^4.12 ^4.13 ^4.14 Harmanec, P.; Holmgren, D. E.; Wolf, M.; Božić, H.; Guinan, E. F.; Kang, Y. W.; Mayer, P.; McCook, G. P. et al. (March 2014). "Revised physical elements of the astrophysically important O9.5+O9.5V eclipsing binary system Y Cygni". Astronomy and Astrophysics 563: A120. doi:10.1051/0004-6361/201323230. ISSN 0004-6361. Bibcode: 2014A&A...563A.120H.
↑ 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.
↑ Jones, Harold Spencer (1 November 1942). "John Stanley Plaskett, 1865-1941". The Royal Society 4 (11): 67–82. doi:10.1098/rsbm.1942.0007.
↑ Redman, R. O. (August 1930). "Y Cygni.". The Astronomical Society of the Pacific 42: 250. doi:10.1086/124047. Bibcode: 1930PASP...42..250R.
↑ Struve, O.; Sahade, J.; Zabergs, V. (January 1959). "Y Cygni.". Astrophysical Journal 129: 59. doi:10.1086/146595. Bibcode: 1959ApJ...129...59S.
↑ Vitrichenko, E. A. (1971). "The improvement of the Spectroscopic orbit of Y Cyg.". Società Astronomia Italiana 43: 71. Bibcode: 1972MmSAI..43...71V.
↑ Vitrichenko, E. A. (1971). "The improvement of the Spectroscopic orbit of Y Cyg.". Izv. Krym. Astrofiz. Obs. 43: 71–75. Bibcode: 1971IzKry..43...71V.
↑ Gimenez, A.; Costa, V. (December 1980). "Y CYG : photometry and apsidal motion.". The Astronomical Society of the Pacific 92: 782–784. doi:10.1086/130747. Bibcode: 1980PASP...92..782G.

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Original source: https://en.wikipedia.org/wiki/Y Cygni. Read more

[MAST-1] "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.

[DR3-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.

[gcvs-3] 3.0 ^3.1 Samus, N. N. 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.

[harmanec2014-4] 4.00 ^4.01 ^4.02 ^4.03 ^4.04 ^4.05 ^4.06 ^4.07 ^4.08 ^4.09 ^4.10 ^4.11 ^4.12 ^4.13 ^4.14 Harmanec, P.; Holmgren, D. E.; Wolf, M.; Božić, H.; Guinan, E. F.; Kang, Y. W.; Mayer, P.; McCook, G. P. et al. (March 2014). "Revised physical elements of the astrophysically important O9.5+O9.5V eclipsing binary system Y Cygni". Astronomy and Astrophysics 563: A120. doi:10.1051/0004-6361/201323230. ISSN 0004-6361. Bibcode: 2014A&A...563A.120H.

[hill95-5] 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.

[plaskett-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.

[ycyg-7] Redman, R. O. (August 1930). "Y Cygni.". The Astronomical Society of the Pacific 42: 250. doi:10.1086/124047. Bibcode: 1930PASP...42..250R.

[ycyg2-8] Struve, O.; Sahade, J.; Zabergs, V. (January 1959). "Y Cygni.". Astrophysical Journal 129: 59. doi:10.1086/146595. Bibcode: 1959ApJ...129...59S.

[ycyg3-9] Vitrichenko, E. A. (1971). "The improvement of the Spectroscopic orbit of Y Cyg.". Società Astronomia Italiana 43: 71. Bibcode: 1972MmSAI..43...71V.

[ycyg3.5-10] Vitrichenko, E. A. (1971). "The improvement of the Spectroscopic orbit of Y Cyg.". Izv. Krym. Astrofiz. Obs. 43: 71–75. Bibcode: 1971IzKry..43...71V.

[ycyg4-11] Gimenez, A.; Costa, V. (December 1980). "Y CYG : photometry and apsidal motion.". The Astronomical Society of the Pacific 92: 782–784. doi:10.1086/130747. Bibcode: 1980PASP...92..782G.

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Observation data Equinox J2000.0]] (ICRS)
A light curve for Y Cygni, plotted from TESS data^[1]
Constellation	Cygnus
Right ascension	20^h 52^m 3.57718^s^[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^[2] mas
Distance	4,900 ly (1,500^[4] pc)
Absolute magnitude (M_V)	−3.59/−3.62^[4]
Absolute bolometric magnitude (M_bol)	−6.65±0.04/−6.7±0.04^[4]

Orbit^[4]
Primary	Y Cyg A
Companion	Y 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 periapsis (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`_☉
Luminosity	37,700 `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

Topic: Astronomy

Observation history

References