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Variable star in the constellation Aquila
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
^
a
b 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 .
^
a
b
c
d
e
f
g
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 .
^
a
b
c
d 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 .
^
a
b
c 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 .
S2CID
125853869 .
^
a
b
c 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 .
^ 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 .
S2CID
119089236 .
^
a
b
c 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 .
S2CID
195833749 .
^ 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 .
S2CID
54940439 .
^
"HD 188041" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2020-02-19 .
^ 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 .
S2CID
14878976 .
^ 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 .
S2CID
123397055 .
External links