Astronomy:V1291 Aquilae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 53m 18.73574s[2] |
| Declination | −03° 06′ 52.0653″[2] |
| Apparent magnitude (V) | 5.65[3] (5.61 to 5.67)[4] |
| Characteristics | |
| Evolutionary stage | Main sequence[5] |
| Spectral type | F0VpSrCrEu[5] |
| U−B color index | +0.10[3] |
| B−V color index | +0.20[3] |
| Variable type | α2 CVn[4] |
| Astrometry | |
| Radial velocity (Rv) | −21.850±0.0005[2] km/s |
| Proper motion (μ) | RA: +21.578[2] mas/yr Dec.: +14.186[2] mas/yr |
| Parallax (π) | 11.7248 ± 0.1011[2] mas |
| Distance | 278 ± 2 ly (85.3 ± 0.7 pc) |
| Details[6] | |
| Mass | 2.26±0.05[7] M☉ |
| Radius | 2.32±0.19 R☉ |
| Luminosity | 25.7+2.3 −1.8 L☉ |
| Surface gravity (log g) | 4.03±0.08 cgs |
| Temperature | 8,770±30[7] K |
| Metallicity [Fe/H] | 1.00[8] dex |
| Rotational velocity (v sin i) | 6.7±0.5 km/s |
| Age | 670±210 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V1291 Aquilae is a single[10] 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.[3] 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.[2]
This is a magnetic chemically peculiar star, or Ap star, with a stellar classification of F0VpSrCrEu,[5] 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[4] with a period of 223.826 days. This is most likely the mean rotational period of the star.[1] 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.[7]
References
- ↑ 1.0 1.1 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. http://articles.adsabs.harvard.edu/full/2003CoSka..33...29M.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 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.
- ↑ 4.0 4.1 4.2 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 5.0 5.1 5.2 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A.
- ↑ 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. doi:10.1093/mnras/sty3105. Bibcode: 2019MNRAS.483.2300S.
- ↑ 7.0 7.1 7.2 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. doi:10.1093/mnras/stz1858. Bibcode: 2019MNRAS.488.2343R.
- ↑ Prugniel, P. et al. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics 531: A165. doi:10.1051/0004-6361/201116769. Bibcode: 2011A&A...531A.165P.
- ↑ "HD 188041". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+188041.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 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. doi:10.1086/521962. Bibcode: 2007PASP..119..980A.
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