V Aquilae

From Wikipedia, the free encyclopedia
Jump to: navigation, search
V Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 04m 24.155s[1]
Declination −05° 41′ 05.44″[1]
Apparent magnitude (V) 6.78[2]
Characteristics
Spectral type CII[2]
B−V color index +4.32[3]
Variable type Semiregular
Astrometry
Radial velocity (Rv) +37[4] km/s
Proper motion (μ) RA: 5.22 ± 0.59[1] mas/yr
Dec.: −0.55 ± 0.48[1] mas/yr
Parallax (π) 2.76 ± 0.69[1] mas
Distance approx. 1,200 ly
(approx. 360 pc)
Details
Temperature 2,611[5] K
Metallicity [Fe/H] 0.10[5] dex
Other designations
BD−05° 4858, HD 177336, HIP 93666, HR 7220, SAO 142985.[2]
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

V Aquilae (V Aql) is a carbon star in the constellation Aquila. This is a type of star with a spectrum that is dominated by strong absorption lines of the molecules C2 and CN. The enhanced levels of carbon in the atmosphere may have been contributed by recently nucleosynthesized material that has been dredged up to the surface. This is a variable star of type SRb.[5]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c "V* V Aql -- Semi-regular pulsating Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-10-06. 
  3. ^ Nicolet, B. (October 1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy & Astrophysics Supplement Series 34: 1–49. Bibcode:1978A&AS...34....1N. 
  4. ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495..... 
  5. ^ a b c Lambert, David L.; Gustafsson, Bengt; Eriksson, Kjell; Hinkle, Kenneth H. (October 1986). "The chemical composition of carbon stars. I - Carbon, nitrogen, and oxygen in 30 cool carbon stars in the Galactic disk". Astrophysical Journal Supplement Series 62: 373–425. Bibcode:1986ApJS...62..373L. doi:10.1086/191145. 

External links[edit]