R Aquilae

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R Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 06m 22.2514s
Declination +08° 13′ 48.007″
Apparent magnitude (V) 5.3 - 12.0[1]
Characteristics
Spectral type M6.5-9e[2]
U−B color index 0.37[2]
B−V color index 1.60[2]
Variable type Mira[3]
Astrometry
Radial velocity (Rv) 34.60[2] km/s
Proper motion (μ) RA: 3.79[2] mas/yr
Dec.: -67.01[2] mas/yr
Parallax (π) 2.37 ± 0.87[2] mas
Distance 214+45
−32
[4] pc
Details
Mass 1.0[4] M
Radius 259 ± 67[5] R
Luminosity 3,470 ± 50[4] L
Temperature 3,000 ± 300[4] K
Other designations
BD+08 3970, HD 177940, HIP 93820, HR 7243, SAO 124266
Database references
SIMBAD data

R Aquilae is a Mira variable in the constellation Aquila. Over a period of approximately 270 days, the apparent magnitude of this star varies from 5.5 to 12.[3] The period was over 300 days when first observed, and has declined steadily since.[6]

References[edit]

  1. ^ 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. Bibcode:2009yCat....102025S. 
  2. ^ a b c d e f g "R Aquilae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 23 June 2014. 
  3. ^ a b VSX; Otero, Sebastian (4 January 2011). "R Aquilae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013. 
  4. ^ a b c d Zhao-Geisler, R.; Quirrenbach, A.; Köhler, R.; Lopez, B. (2012). "Dust and molecular shells in asymptotic giant branch stars". Astronomy & Astrophysics. 545: A56. arXiv:1207.3767Freely accessible. Bibcode:2012A&A...545A..56Z. doi:10.1051/0004-6361/201118150. 
  5. ^ Van Belle, G. T.; Thompson, R. R.; Creech-Eakman, M. J. (2002). "Angular Size Measurements of Mira Variable Stars at 2.2 Microns. II". The Astronomical Journal. 124 (3): 1706. arXiv:astro-ph/0210167Freely accessible. Bibcode:2002AJ....124.1706V. doi:10.1086/342282. 
  6. ^ Greaves, J; Howarth, J. J. (June 2000). "Further investigations of R Aquilae". Journal of the British Astronomical Association. 110 (3): 131–142. Bibcode:2000JBAA..110..131G.