W Aquilae information

W Aquilae
	; W Aquilae showing the close companion; Credit: Hubble Legacy Archive
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	19h 15m 23.357s
Declination	−07° 02′ 50.33″
Apparent magnitude (V)	A: 7.0 - 14.6; B:14.8
Characteristics
A
Evolutionary stage	asymptotic giant branch
Spectral type	S6/6e (S3,9e - S6,9e)
B−V color index	+2.58
Variable type	Mira
B
Evolutionary stage	main sequence
Spectral type	F8/9
Astrometry
Radial velocity (Rv)	−18.0 km/s
Proper motion (μ)	RA: 15.713 mas/yr ; Dec.: 0.103 mas/yr
Parallax (π)	2.6735 ± 0.1392 mas
Distance	1,220 ± 60 ly ; (370 ± 20 pc)
Absolute magnitude (MV)	A: −0.7 to +6.9; B: +7.1
Details
A
Mass	1.04 - 3 M☉
Radius	444 R☉
Luminosity	7,500 L☉
Temperature	2,800 K
B
Mass	1.04 - 1.09 M☉
Temperature	5,900 - 6,170 K
Other designations
	W Aql, IRAS 19126-0708, TYC 5142-2895-1, 2MASS J19152335-0702503, AAVSO 1910-07, Gaia DR2 420492505899016640
Database references
SIMBAD	data

W Aquilae (W Aql) is a variable star in the constellation of Aquila. It is a type of evolved star known as an S-type star. Due to its relatively close distance of 1,200 light-years (370 pc) and equatorial location, it is easy to observe and heavily studied.^[9]

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c Cite error: The named reference gcvs was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference mayer was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference danilovich was invoked but never defined (see the help page).
^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
^ Cite error: The named reference gcrv was invoked but never defined (see the help page).
^ ^a ^b Wallstrom, S. H. J.; Danilovich, T.; Muller, H. S. P.; Gottlieb, C. A.; Maes, S.; Van de Sande, M.; Decin, L.; Richards, A. M. S.; Baudry, A.; Bolte, J.; Ceulemans, T.; De Ceuster, F.; de Koter, A.; Mellah, I. El; Esseldeurs, M. (December 6, 2023). "ATOMIUM: Molecular inventory of 17 oxygen-rich evolved stars observed with ALMA". Astronomy & Astrophysics. 681: A50. arXiv:2312.03467. doi:10.1051/0004-6361/202347632. ISSN 0004-6361.
^ Brunner, M.; Danilovich, T.; Ramstedt, S.; Marti-Vidal, I.; De Beck, E.; Vlemmings, W. H. T.; Lindqvist, M.; Kerschbaum, F. (2018). "Molecular line study of the S-type AGB star W Aquilae". Astronomy & Astrophysics. 617: A23. arXiv:1806.01622. doi:10.1051/0004-6361/201832724. S2CID 67754573.
^ Cite error: The named reference Danilovich2021 was invoked but never defined (see the help page).

Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

[dr3-1] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[gcvs-2] Cite error: The named reference gcvs was invoked but never defined (see the help page).

[mayer-3] Cite error: The named reference mayer was invoked but never defined (see the help page).

[danilovich-4] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference danilovich was invoked but never defined (see the help page).

[tycho2-5] Cite error: The named reference tycho2 was invoked but never defined (see the help page).

[gcrv-6] Cite error: The named reference gcrv was invoked but never defined (see the help page).

[wallstrom-7] Wallstrom, S. H. J.; Danilovich, T.; Muller, H. S. P.; Gottlieb, C. A.; Maes, S.; Van de Sande, M.; Decin, L.; Richards, A. M. S.; Baudry, A.; Bolte, J.; Ceulemans, T.; De Ceuster, F.; de Koter, A.; Mellah, I. El; Esseldeurs, M. (December 6, 2023). "ATOMIUM: Molecular inventory of 17 oxygen-rich evolved stars observed with ALMA". Astronomy & Astrophysics. 681: A50. arXiv:2312.03467. doi:10.1051/0004-6361/202347632. ISSN 0004-6361.

[brunner-9] Brunner, M.; Danilovich, T.; Ramstedt, S.; Marti-Vidal, I.; De Beck, E.; Vlemmings, W. H. T.; Lindqvist, M.; Kerschbaum, F. (2018). "Molecular line study of the S-type AGB star W Aquilae". Astronomy & Astrophysics. 617: A23. arXiv:1806.01622. doi:10.1051/0004-6361/201832724. S2CID 67754573.

[Danilovich2021-10] Cite error: The named reference Danilovich2021 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
W Aquilae showing the close companion Credit: Hubble Legacy Archive
Constellation	Aquila
Right ascension	19^h 15^m 23.357^s^[1]
Declination	−07° 02′ 50.33″^[1]
Apparent magnitude (V)	A: 7.0 - 14.6^[2] B:14.8 ^[3]
Characteristics
A
Evolutionary stage	asymptotic giant branch^[4]
Spectral type	S6/6e^[4] (S3,9e - S6,9e^[2])
B−V color index	+2.58^[5]
Variable type	Mira^[2]

B
Evolutionary stage	main sequence^[4]
Spectral type	F8/9^[4]
Astrometry

Radial velocity (R_v)	−18.0^[6] km/s
Proper motion (μ)	RA: 15.713^[1] mas/yr Dec.: 0.103^[1] mas/yr
Parallax (π)	2.6735 ± 0.1392 mas^[1]
Distance	1,220 ± 60 ly (370 ± 20 pc)
Absolute magnitude (M_V)	A: −0.7 to +6.9^[3] B: +7.1^[3]

Details
A
Mass	1.04 - 3^[4] `M`_☉
Radius	444^[7]^[a] `R`_☉
Luminosity	7,500^[8] `L`_☉
Temperature	2,800^[7] K
B
Mass	1.04 - 1.09^[4] `M`_☉
Temperature	5,900 - 6,170^[4] K
Other designations
W Aql, IRAS 19126-0708, TYC 5142-2895-1, 2MASS J19152335-0702503, AAVSO 1910-07, Gaia DR2 420492505899016640
Database references
SIMBAD	data

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