LP Andromedae

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LP Andromedae
LPAndLightCurve.png
A near-infrared (L band) light curve for LP Andromedae, adapted from Jones et al. (1990) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 23h 34m 27.5216s [2]
Declination +43° 33′ 01.2996″ [2]
Apparent magnitude  (V)15.12 variable [3]
Characteristics
Spectral type C8,3.5e [4]
Apparent magnitude  (G)16.9041 [2]
Apparent magnitude  (J)9.623 [5]
Apparent magnitude  (H)6.355 [5]
Apparent magnitude  (K)2.71 [6]
Variable type Mira [7]
Astrometry
Proper motion (μ)RA: −21.313±0.532 [2] mas/yr
Dec.: −22.058±0.453 [2] mas/yr
Parallax (π)2.5002±0.3626  mas [2]
Distance approx. 1,300  ly
(approx. 400  pc)
Absolute bolometric
magnitude  (Mbol)		−5.21±0.26 [8]
Details [8]
Mass 0.8  M☉
Radius 340 – 420  R☉
Luminosity 2,900 – 16,200  L☉
Temperature 2,100 – 3,350  K
Other designations
2MASS J23342752+4333012, IRAS 23320+4316, RAFGL 3116
Database references
SIMBAD data

LP Andromedae (often abbreviated to LP And) is a carbon star in the constellation Andromeda. It is also a Mira variable [7] whose mean apparent visual magnitude is 15.12 and has pulsations with an amplitude of 1.50 magnitudes [3] and a period of 614 days. [8]

In 1974 LP Andromedae, known then as IRC+40540, was identified as a carbon star and also shown to be variable. [9] It had previously been suspected of variability during the 2 Micron All Sky Survey (2MASS). A detailed study of its spectrum showed an unusually cool star with a basic class of C8, and Swan band strength of 3.5. It also showed strong C13 isotopic bands. [4] The period was narrowed down to around 614 days, one of the longest periods known for a Mira variable. [10]

This star has a dusty envelope with an estimated mass of 3.2 M☉, fueled by the star itself which is losing mass at a rate 1.9×10−5M☉/yr. Such a high mass loss rate should place LP Andromedae close to the end of its asymptotic giant branch evolution. The envelope extends to a distance of 3 parsec from the star, and is mainly made of silicon carbide and carbon particles. [8]

See also

References

  1. ↑ Jones, Terry Jay; Bryja, C. O.; Gehrz, Robert D.; Harrison, Thomas E.; Johnson, Joni J.; Klebe, Dimitri I.; Lawrence, Geoffrey F. (November 1990). "Photometry of Variable AFGL Sources". Astrophysical Journal Supplement. 74: 785. Bibcode:1990ApJS...74..785J. doi: 10.1086/191518 .
  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 Database entry, The Catalina Surveys periodic variable star catalog. (Drake+, 2014), A. J. Drake et al., CDS ID J/ApJS/213/9 Accessed on line 2018-11-14.
  4. 1 2 Cohen, M. (1979). "Circumstellar envelopes and the evolution of carbon stars". Monthly Notices of the Royal Astronomical Society. 186 (4): 837–852. Bibcode:1979MNRAS.186..837C. doi: 10.1093/mnras/186.4.837 .
  5. 1 2 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. ↑ Menzies, J. W.; Feast, M. W.; Whitelock, P. A. (June 2006). "Carbon-rich Mira variables: radial velocities and distances". Monthly Notices of the Royal Astronomical Society. 369 (2): 783–790. arXiv: astro-ph/0603505 . Bibcode:2006MNRAS.369..783M. CiteSeerX   10.1.1.255.9712 . doi: 10.1111/j.1365-2966.2006.10323.x . S2CID   18684991.
  7. 1 2 N. N. Samus; O. V. Durlevich; et al. "LP And database entry". Combined General Catalog of Variable Stars (2017 ed.). CDS . Retrieved 2018-11-14.
  8. 1 2 3 4 Men'shchikov, A. B.; Balega, Y. Y.; Berger, M.; Driebe, T.; Hofmann, K.-H.; Maximov, A. F.; Schertl, D.; Shenavrin, V. I.; Weigelt, G. (March 2006). "Near-infrared speckle interferometry and radiative transfer modelling of the carbon star LP Andromedae". Astronomy and Astrophysics. 448 (1): 271–281. Bibcode:2006A&A...448..271M. doi: 10.1051/0004-6361:20052976 .
  9. ↑ Lockwood, G. W. (1974). "Near-infrared photometry of unidentified IRC stars. II". The Astrophysical Journal. 192: 113. Bibcode:1974ApJ...192..113L. doi: 10.1086/153041 .
  10. ↑ Alksnis, A. (1989). "On the Variability of the Dusty Carbon Star LP and". Information Bulletin on Variable Stars. 3396: 1. Bibcode:1989IBVS.3396....1A.
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