CN Andromedae

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CN Andromedae
CNAndLightCurve.png
The visual band light curve of CN Andromedae, adapted from a plot presented by Varol Keskin [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 00h 20m 30.54209s [2]
Declination +40° 13′ 33.80342″ [2]
Apparent magnitude  (V)9.62 – 10.21 variable [3]
Characteristics
Spectral type F5V [3]
Apparent magnitude  (B)10.24 [4]
Apparent magnitude  (V)9.706 [4]
Apparent magnitude  (G)9.6637 [2]
Apparent magnitude  (J)8.670 [5]
Apparent magnitude  (H)8.452 [5]
Apparent magnitude  (K)8.427 [5]
B−V color index 0.49725 [4]
Variable type EB [3]
Astrometry
Radial velocity (Rv)−24.2±1.0 [6] km/s
Proper motion (μ)RA: −8.549±0.054 [2] mas/yr
Dec.: −35.291±0.024 [2] mas/yr
Parallax (π)4.9670±0.0425  mas [2]
Distance 657 ± 6  ly
(201 ± 2  pc)
Orbit [6]
Period (P)0.4627952±0.000035 days
Semi-major axis (a)3.066±0.035
Inclination (i)68.51±0.17°
Periastron epoch (T)HJD 2445231.51710±0.00059
Details
Primary
Mass 1.433±0.030 [7]   M☉
Radius 1.48±0.03 [7]   R☉
Luminosity 3.40 [7]   L☉
Surface gravity (log g)4.24 [6]   cgs
Temperature 6,450 [7]   K
Secondary
Mass 0.552±0.020 [7]   M☉
Radius 0.95 [7]   R☉
Luminosity0.40 [7]   L☉
Surface gravity (log g)4.22 [6]   cgs
Temperature 4,726 [7]   K
Other designations
2MASS J00203054+4013337, BD+39 59, TYC 2787-1815-1
Database references
SIMBAD data

CN Andromedae (CN And) is an eclipsing binary star in the constellation Andromeda. Its maximum apparent visual magnitude is 9.62 and drops down to a minimum of 10.2 during the main eclipse. It is classified as a Beta Lyrae variable with a period roughly of 0.4628 days. [3]

Contents

System

The two stars in this system orbit very close to each other; their spectrum cannot be separated and as a whole they have a spectrum of an F5V star. They are in marginal contact, [7] and there is a mass flow from the primary star to the secondary at a rate of 1.4 × 10−7M☉ yr−1. [6] The binary orbit is slowly decaying at rate 1.5*10−7 days/year. The third suspected component of the system is the red dwarf star with mass about 0.11 M☉, at 38±4 years orbit around binary. [8]

Variability

Confirmation of the variability of CN Andromedae was announced by R. Weber in 1956. [9] The light curve of the star shows a primary eclipse, with its brightness dropping down to 10.21 magnitude, and a secondary one down to a magnitude of 9.9. [3] This phenomenon repeats with a cycle of approximately 11.1 hours, with period decreasing in time due to the mass transfer from one star to the other. [6]

References

  1. ↑ Keskin, Varol (March 1989). "Light Changes of the Close Binary System CN Andromedae". Astrophysics and Space Science. 153 (2): 191–199. Bibcode:1989Ap&SS.153..191K. doi:10.1007/BF00636655. S2CID   117239888 . Retrieved 7 October 2021.
  2. 1 2 3 4 5 6 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 4 5 CN And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2018-10-17.
  4. 1 2 3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27 –L30, Bibcode:2000A&A...355L..27H.
  5. 1 2 3 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  6. 1 2 3 4 5 6 Van Hamme, W.; Samec, R. G.; Gothard, N. W.; Wilson, R. E.; Faulkner, D. R.; Branly, R. M. (2001). "CN Andromedae: A Broken-Contact Binary?". The Astronomical Journal. 122 (6): 3436–3446. Bibcode:2001AJ....122.3436V. doi: 10.1086/324110 .
  7. 1 2 3 4 5 6 7 8 9 Siwak, M.; Zola, S.; Koziel-Wierzbowska, D. (2010). "A Study of Contact Binaries with Large Temperature Differences between Components". Acta Astronomica. 60 (4): 305–336. arXiv: 1011.5682 . Bibcode:2010AcA....60..305S.
  8. ↑ Yildirim, Muhammed (2019). "CN Andromedae: a shallow contact binary with a possible tertiary component". Research in Astronomy and Astrophysics. 19 (1): 10-1 –10-10. doi: 10.1088/1674-4527/19/1/10 .
  9. ↑ Weber, R. (January 1956). "Examen de 138 étoiles du "Catalogue of suspected variable stars"". Journal des Observateurs. 39: 113. Bibcode:1956JO.....39..113W . Retrieved 30 October 2024.
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