2007A&A...473..579S

Query : 2007A&A...473..579S

2007A&A...473..579S - Astronomy and Astrophysics, volume 473579-587 (2007/10-2)

New homogeneous iron abundances of double-mode Cepheids from high-resolution echelle spectroscopy.

SZILADI K., VINKO J., PORETTI E., SZABADOS L. and KUN M.

Abstract (from CDS):

We define the relationship between the double-mode pulsation of Cepheids and metallicity in a more accurate way, determine the empirical metallicities of double-mode Cepheids from homogeneous, high-resolution spectroscopic data, and study of the period-ratio - metallicity dependence. The high S/N echelle spectra obtained with the FEROS spectrograph were analyzed using a self-developed IRAF script, and the iron abundances were determined by comparing with synthetic spectra assuming LTE. Accurate [Fe/H] values of 17 galactic beat Cepheids were determined. All these stars have solar or slightly subsolar metallicity. Their period ratio (P1/P0) shows strong correlation with their derived [Fe/H] values. The corresponding period ratio - metallicity relation has been evaluated.

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Journal keyword(s): stars: variables: Cepheids - stars: atmospheres - stars: general

Simbad objects: 22

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Number of rows : 22
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* TU Cas cC* 00 26 19.4488112352 +51 16 49.292204088   8.507 7.835     F4 212 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 V* SU Cas cC* 02 51 58.7511911208 +68 53 18.606894036 6.92 6.44 5.80     F5.5III+ 444 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 V* CO Aur cC* 06 00 28.5064756848 +35 18 43.852562928   8.34 7.73     F5Ib 101 0
7 V* VX Pup cC* 07 32 36.6489773592 -21 55 49.534161528   9.87 9.32 8.97   F3IV 147 0
8 V* AX Vel cC* 08 10 49.3236457224 -47 41 54.828934332   8.78 8.16     F6II 127 0
9 V* AP Vel cC* 08 39 45.7557936912 -43 51 39.163001040   11.17 10.16     F9 106 0
10 V* V701 Car cC* 10 09 13.6141771968 -57 14 33.360686628   12.39 11.10 10.64   ~ 23 0
11 V* GZ Car cC* 10 20 20.3716366488 -59 22 35.834822616   11.15 10.20     G5 102 0
12 V* Y Car cC* 10 33 10.8500390952 -58 29 55.095062136   8.75 8.16     F0/3 152 0
13 V* EY Car cC* 10 42 23.0317207392 -61 09 57.295281744   11.05 10.35     ~ 83 0
14 V* V1048 Cen cC* 11 28 42.6634698048 -59 25 43.337724744   11.09 10.50   9.57 F8 34 0
15 V* UZ Cen cC* 11 40 58.5379283208 -62 41 32.933904396   9.60 8.30   7.909 F3Ib/II 130 0
16 V* BK Cen cC* 11 49 16.0153669440 -63 04 42.905812404   11.04 10.19     G5 105 0
17 V* V1210 Cen cC* 14 36 55.5558787272 -58 15 41.219542908   11.29 10.27     ~ 27 0
18 V* U TrA cC* 16 07 19.0044671808 -62 54 38.018675304   8.43 7.89     F8Ib/II 149 0
19 V* V458 Sct cC* 18 22 27.0663763008 -10 07 29.181954072   10.74 9.81     ~ 33 0
20 V* V367 Sct cC* 18 33 35.2353033192 -10 25 38.126250552   13.34 11.580     F7Ib 187 0
21 V* BQ Ser cC* 18 36 15.9375844368 +04 23 53.693400840   10.49 9.21     F5III 114 0
22 V* EW Sct cC* 18 37 51.1112159832 -06 47 48.494842332   9.50 7.96     F8Ib/II 117 0

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