V1291 Aquilae

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V1291 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 53m 18.736s[1]
Declination −03° 06′ 52.06″[1]
Apparent magnitude (V) 5.65[2]
Spectral type F0VpSrCrEu[3]
U−B color index +0.10[2]
B−V color index +0.20[2]
Variable type α² CVn[4]
Radial velocity (Rv) −20.4±0.4[5] km/s
Proper motion (μ) RA: 22.28±0.36[1] mas/yr
Dec.: 14.20±0.31[1] mas/yr
Parallax (π) 12.48 ± 0.36[1] mas
Distance 261 ± 8 ly
(80 ± 2 pc)
Luminosity 27[6] L
Surface gravity (log g) 3.91±0.42[7] cgs
Temperature 9506±449[7] K
Metallicity [Fe/H] 1.00[7] dex
Rotational velocity (v sin i) 49[8] km/s
Other designations
BD−03° 4742, GCRV 12231, HD 188041, HIP 97871, HR 7575, SAO 143883.
Database references

V1291 Aquilae is a chemically peculiar Ap star. This is a variable star of type Alpha² Canum Venaticorum with a variability period of 223.826 days. This is most likely the mean rotational period of the star.[9]


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N 
  3. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. 
  4. ^ Kukarkin, B. V.; et al. (1981), Nachrichtenblatt der Vereinigung der Sternfreunde e.V., Moscow: Academy of Sciences USSR Shternberg, Bibcode:1981NVS...C......0K 
  5. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x 
  7. ^ a b c Prugniel, P.; Vauglin, I.; Koleva, M. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics. 531: A165. arXiv:1104.4952Freely accessible. Bibcode:2011A&A...531A.165P. doi:10.1051/0004-6361/201116769. 
  8. ^ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255Freely accessible, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943 
  9. ^ Mikulásek, Z.; et al. (2003). "Improved period of a slowly rotating cool magnetic CP star HD188041". Contributions of the Astronomical Observatory Skalnaté Pleso. 33 (1): 29–37. Bibcode:2003CoSka..33...29M. 

Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram, 4, Bibcode:1962MtSOM...4....1B 

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