V1291 Aquilae

V1291 Aquilae is a single[9] star in the equatorial constellation of Aquila. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.65.[2] Based on parallax measurements, it is located at a distance of approximately 278 light years from the Sun. The star it is drifting closer with a radial velocity of −22 km/s.[1]

V1291 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension  19h 53m 18.73574s[1]
Declination −03° 06′ 52.0653″[1]
Apparent magnitude (V) 5.65[2] (5.61 to 5.67)[3]
Characteristics
Evolutionary stage Main sequence[4]
Spectral type F0VpSrCrEu[4]
U−B color index +0.10[2]
B−V color index +0.20[2]
Variable type α2 CVn[3]
Astrometry
Radial velocity (Rv)−21.850±0.0005[1] km/s
Proper motion (μ) RA: +21.578[1] mas/yr
Dec.: +14.186[1] mas/yr
Parallax (π)11.7248 ± 0.1011[1] mas
Distance278 ± 2 ly
(85.3 ± 0.7 pc)
Details[5]
Mass2.26±0.05[6] M☉
Radius2.32±0.19 R☉
Luminosity25.7+2.3
−1.8 L☉
Surface gravity (log g)4.03±0.08 cgs
Temperature8,770±30[6] K
Metallicity [Fe/H]1.00[7] dex
Rotational velocity (v sin i)6.7±0.5 km/s
Age670±210 Myr
Other designations
V1291 Aql, BD−03°4742, HD 188041, HIP 97871, HR 7575, SAO 143883[8]
Database references
SIMBADdata

This is a magnetic chemically peculiar star, or Ap star, with a stellar classification of F0VpSrCrEu,[4] matching an F-type main-sequence star with abundance anomalies of strontium, chromium, and europium in the spectrum. It is a variable star of type Alpha2 Canum Venaticorum that ranges in visual magnitude from 5.61 down to 5.67[3] with a period of 223.826 days. This is most likely the mean rotational period of the star.[10] V1291 Aquilae was one of the first Ap stars discovered with a period of more than 100 days.[11] It shows a surface magnetic field strength of 3.6 kG.[6]

References
  1. 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.
  2. 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. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  4. 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.
  5. Sikora, J.; et al. (February 2019). "A volume-limited survey of mCP stars within 100 pc - I. Fundamental parameters and chemical abundances". Monthly Notices of the Royal Astronomical Society. 483 (2): 2300–2324. arXiv:1811.05633. Bibcode:2019MNRAS.483.2300S. doi:10.1093/mnras/sty3105.
  6. Romanovskaya, A.; et al. (September 2019). "Fundamental parameters and evolutionary status of the magnetic chemically peculiar stars HD 188041 (V1291 Aquilae), HD 111133 (EP Virginis), and HD 204411: spectroscopy versus interferometry". Monthly Notices of the Royal Astronomical Society. 488 (2): 2343–2356. arXiv:1907.03598. Bibcode:2019MNRAS.488.2343R. doi:10.1093/mnras/stz1858.
  7. Prugniel, P.; et al. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics. 531: A165. arXiv:1104.4952. Bibcode:2011A&A...531A.165P. doi:10.1051/0004-6361/201116769.
  8. "HD 188041". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-19.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  10. 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.
  11. Adelman, Saul J. (September 2007). "FCAPT uvby Photometry of the mCP Stars HD 16545, HD 93226, HR 7575, and HR 8206". The Publications of the Astronomical Society of the Pacific. 119 (859): 980–985. Bibcode:2007PASP..119..980A. doi:10.1086/521962.
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