2001A&A...376..892P


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET18:33:54

2001A&A...376..892P - Astronomy and Astrophysics, volume 376, 892-897 (2001/9-4)

Metallicity effects on classical Cepheids: Velocity curve morphology of outer disc Cepheids.

PONT F., KIENZLE F., GIEREN W. and FOUQUE P.

Abstract (from CDS):

We present new radial velocity data for eleven classical Cepheids situated in the outer parts of the Galactic disc. The resultant velocity curves for these metal-deficient Cepheids are decomposed in Fourier parameters, and compared to solar-metallicity Cepheid data, in order to study the effect of metallicity on the pulsation properties. Up to P≃8 days, the φ21 phase shift is found to follow very closely the corresponding sequence for solar-metallicity Cepheids, indicating the absence of metallicity effects on φ21 for low periods. However, metal-deficient Cepheids show a slightly larger A1 amplitude and R21 amplitude ratio for P<5 days. At P>12 days, there is some evidence that the φ21 phase shift is significantly larger for metal-deficient Cepheids than at solar metallicity. A posteriori, this effect is also detected in photometric data for outer disc and LMC Cepheids in the 12-20 day period range. In good qualitative agreement with the predictions of theoretical pulsation models, we therefore see some indication of a metallicity dependence of the P2/P0 resonance properties. The largest effects on velocity curve shape are expected in the crucial 8-12 day period range - around the P2/P0 resonance for fundamental-mode Cepheids - that is not covered by our data. Possible targets for future measurements are suggested to fill this gap, and to improve the quantitative determination of metallicity effects on the structural properties of Cepheid velocity curves.

Abstract Copyright:

Journal keyword(s): stars: variable: Cepheid

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9696 1
2 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1121 2
3 V* BW Per Mi* 02 47 08.2442070568 +46 03 29.460311430   10.86 9.33     M2 7 0
4 V* AD Cam cC* 03 29 25.9693397357 +60 26 47.271990543   14.16       ~ 46 0
5 V* HZ Per cC* 04 25 37.2939553772 +45 37 13.143527392   15.89       ~ 35 0
6 V* BM Per cC* 04 29 39.3888285450 +48 25 19.102535927   11.56 10.06     K5 65 0
7 V* OT Per cC* 04 38 37.9378681324 +47 44 25.008084048   15.71 13.47     ~ 36 0
8 V* SV Per cC* 04 49 47.9361288171 +42 17 22.964422403   9.74 8.86     F6-G1 138 0
9 V* CY Aur cC* 04 57 40.0807277112 +46 05 33.112390660   13.44 12.04     ~ 48 0
10 V* YZ Aur cC* 05 15 21.9827122069 +40 04 40.883139360   11.77 10.24     G5 96 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15195 1
12 V* AA Gem cC* 06 06 34.9459286635 +26 19 45.205210801   11.0 9.91   8.540 K0 113 0
13 V* FT Mon cC* 06 21 36.0795073297 +04 04 24.841589393   11   12.23 11.496 ~ 37 0
14 V* CU Mon cC* 06 32 46.7955605374 +00 02 35.316926303   15.02     11.923 ~ 44 0
15 V* WW Mon cC* 06 33 37.1817036531 +09 12 12.840769070   13.65 12.492   11.155 F6 57 0
16 V* V510 Mon cC* 06 47 26.9330231896 +02 31 01.444805612   14.13 12.645   10.858 ~ 34 0
17 V* TW Mon cC* 06 50 32.3362879535 +00 00 25.185938999     12.552   10.939 ~ 42 0
18 V* XX Mon cC* 06 52 12.1699029474 -02 48 25.053620849   12.81 11.52     F6 65 0
19 V* TZ Mon cC* 06 58 00.9347614861 -00 22 33.463317717   11.8       F6 82 0
20 V* FG Mon cC* 07 07 08.5490285558 -07 47 42.473450631   14.44 13.182   11.720 ~ 39 0
21 V* FI Mon cC* 07 10 37.9924208299 -07 07 22.461492125   14.07 12.900   11.578 ~ 43 0
22 V* BC Pup cC* 07 30 02.5526306676 -23 40 26.364259329     13.841   12.247 ~ 25 0
23 V* VZ Pup cC* 07 38 35.2380584126 -28 29 58.597876520   9.73 8.98     F7.5 133 0
24 V* HW Pup cC* 07 57 42.1676771396 -27 36 06.840883085   13.35 12.018   10.51 ~ 48 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-18:33:54

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