2001A&A...377..156U

Query : 2001A&A...377..156U

2001A&A...377..156U - Astronomy and Astrophysics, volume 377156-160 (2001/10-1)

FN Aquilae - an unusual Cepheid with anomalous CNO abundances.

USENKO I.A., KOVTYUKH V.V. and KLOCHKOVA V.G.

Abstract (from CDS):

Spectroscopic analysis of the classical Cepheid FN Aql from three high-resolution CCD spectra near minimum and maximum light gives the following results: 1) Mean Teff=5483K; logg=1.25 and Vt=4.0km/s; 2) Metallicities derived for each phase are consistent with each other and close to the solar value; 3) The Cepheid is crossing the instability strip for at least the third time. 4) It has anomalously low carbon ([C/H]=-0.93dex) and nitrogen ([N/H]=+0.09dex) abundances, which is unusual for a Cepheid not crossing the instability strip for the first time. Since FN Aql is an IRAS object and candidate protoplanetary nebulae according to Volk & Kwok (1989ApJ...342..345V), we assume that the star's peculiarities are caused either by envelope loss after the second dredge-up or that it is an unusual Cepheid for which existing nucleosynthesis and mixing models are unable to reproduce the CNO abundance pattern.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: variables: Cepheids

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* FN Aql cC* 19 12 47.3148920688 +03 33 26.703677448   9.58 7.96     F8/G0Iab/b 197 0

Query : 2001A&A...377..156U

Basic data :
V* FN Aql -- Classical Cepheid Variable
Other object types: otypes_help 		* (HD,AG,...), cC* (2012A&A), V* (AN,V*,...), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		19 12 47.3148920688 +03 33 26.703677448 (Optical) [ 0.0199 0.0190 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		19 10 17.4445307378 +03 28 19.120041377 [ 0.0199 0.0190 90 ]
Gal coord. (ep=J2000) : 		038.5388541226232 -03.1149029658921 [ 0.0199 0.0190 90 ]
Proper motions mas/yr : 		-1.702 -4.472 [0.023 0.020 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 9.5013 [0.0665] / z(spectroscopic) 0.000032 [0.000000] / cz 9.50 [0.07]
   (NIR) A 2022ApJS..259...35A
Parallaxes (mas): 		0.7018 [0.0245] A 2020yCat.1350....0G
Spectral type: 		F8/G0Iab/b D 1999MSS...C05....0H
Fluxes (6) :
B 9.58 [~] E ~
V 7.96 [~] C 2002yCat.2237....0D
G 8.005132 [0.007253] C 2022yCat.1355....0G
J 6.067 [0.021] C 2003yCat.2246....0C
H 5.556 [0.027] C 2003yCat.2246....0C
K 5.327 [0.020] C 2003yCat.2246....0C
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Identifiers (24) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 179494 GSC 00467-00997 SAO 124392 WEB 16451
AG+03 2417 HIC 94402 SV* SVS 227 YZ 3 6585
AN 400.1929 HIP 94402 TIC 181843582 AAVSO 1907+03
BD+03 3941 IRAS 19102+3029 TYC 467-997-1 Gaia DR3 4269036830424588800
GCRV 11660 2MASS J19124731+0333264 uvby98 100179494 Gaia DR1 4269036826095352704
GEN# +1.00179494 PPM 167384 V* FN Aql Gaia DR2 4269036830424588800

References (197 between 1850 and 2026) (Total 197)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 7    Distance : 5    Var : 7    Fe/H : 6    Plx : 5    PM : 5    SpT : 2   

   

Observing logs
IUE : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : V* FN Aql

Link by name to the catalogue in VizieR :

HD 179494 AG+03 2417 BD+03 3941 GSC 00467-00997 HIC 94402
HIP 94402 IRAS 19102+3029 2MASS J19124731+0333264 PPM 167384 SAO 124392
TYC 467-997-1 uvby98 100179494 V* FN Aql Gaia DR3 4269036830424588800 Gaia DR1 4269036826095352704
Gaia DR2 4269036830424588800

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