2008A&A...488..731R

Query : 2008A&A...488..731R

2008A&A...488..731R - Astronomy and Astrophysics, volume 488731-747 (2008/9-3)

The influence of chemical composition on the properties of Cepheid stars. II. The iron content.

ROMANIELLO M., PRIMAS F., MOTTINI M., PEDICELLI S., LEMASLE B., BONO G., FRANCOIS P., GROENEWEGEN M.A.T. and LANEY C.D.

Abstract (from CDS):

The Cepheid period-luminosity (PL) relation is unquestionably one of the most powerful tools at our disposal for determining the extragalactic distance scale. While significant progress has been made in the past few years towards its understanding and characterization both on the observational and theoretical sides, the debate on the influence that chemical composition may have on the PL relation is still unsettled. With the aim to assess the influence of the stellar iron content on the PL relation in the V and K bands, we have related the V-band and the K-band residuals from the standard PL relations of Freedman et al. (2001ApJ...553...47F) and Persson et al. (2004AJ....128.2239P), respectively, to [Fe/H]. We used direct measurements of the iron abundances of 68 Galactic and Magellanic Cepheids from FEROS and UVES high-resolution and high signal-to-noise spectra. We find a mean iron abundance ([Fe/H]) about solar (σ=0.10) for our Galactic sample (32 stars), ~-0.33dex (σ=0.13) for the Large Magellanic Cloud (LMC) sample (22 stars) and ~-0.75dex (σ=0.08) for the Small Magellanic Cloud (SMC) sample (14 stars). Our abundance measurements of the Magellanic Cepheids double the number of stars studied up to now at high resolution. The metallicity affects the V-band Cepheid PL relation and metal-rich Cepheids appear to be systematically fainter than metal-poor ones. These findings depend neither on the adopted distance scale for Galactic Cepheids nor on the adopted LMC distance modulus. Current data do not allow us to reach a firm conclusion concerning the metallicity dependence of the K-band PL relation. The new Galactic distances indicate a small effect, whereas the old ones support a marginal effect. Recent robust estimates of the LMC distance and current results indicate that the Cepheid PL relation is not Universal.

Abstract Copyright: ∼

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

Simbad objects: 77

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Number of rows : 77
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 SV* HV 817 cC* 00 39 16.5691333920 -72 01 58.302644988   14.44 13.847   13.088 ~ 40 0
2 SV* HV 1365 cC* 00 41 49.0807785048 -73 43 42.179263032   15.672 15.080   14.221 ~ 47 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 SV* HV 823 cC* 00 43 48.4446005400 -73 36 48.759009912     13.864   12.790 ~ 52 0
5 SV* HV 824 cC* 00 46 53.1109589208 -72 42 51.733779624   12.67 12.04   11.421 G0Iab 72 0
6 SV* HV 829 cC* 00 50 28.7968305768 -72 45 09.210864996 12.97 12.26 11.63   11.017 G0Ib 91 0
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
8 SV* HV 834 cC* 00 53 42.6456610344 -72 17 13.632027000   12.48 11.89   11.268 F2Ib 71 0
9 SV* HV 837 cC* 00 55 56.0568870768 -71 59 02.691309588     13.233   12.297 ~ 68 0
10 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
11 SV* HV 847 cC* 01 01 02.6894208816 -72 11 54.228753168     13.907   13.035 ~ 41 0
12 SV* HV 1954 cC* 01 04 00.3155585376 -72 13 59.863595916     14.003   13.254 F2: 40 0
13 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
14 SV* HV 2064 cC* 01 08 11.5815677400 -72 31 18.347987676     13.732   12.768 ~ 43 0
15 SV* HV 2195 cC* 01 14 28.0646245968 -72 39 53.532235548   14.02 13.115   12.144 F5Ib 54 0
16 V* BF Tuc cC* 01 17 52.9977109896 -73 37 25.153110048 14.94 14.51 13.72   12.89 F0 45 0
17 V* ST Hyi cC* 01 40 32.2011876336 -74 30 25.591222656   13.49 13.289   12.289 ~ 34 0
18 SV* HV 11211 cC* 02 20 49.4874864192 -73 05 08.320297344   14.88 13.836   13.125 ~ 32 0
19 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
20 V* SZ Tau cC* 04 37 14.7776556504 +18 32 34.926940860 7.65 7.13 6.37     F6.7:Ib 316 0
21 SV* HV 12452 cC* 04 48 51.3419874096 -69 21 22.760929404   15.53 14.755 14.40 13.941 ~ 42 0
22 SV* HV 5497 cC* 04 55 40.5527820192 -66 25 43.318661664     11.930 11.38 10.88 G2Ib 89 0
23 SV* HV 877 cC* 04 57 01.7944309968 -67 59 42.589297284     13.363   12.232 ~ 59 0
24 SV* HV 879 cC* 04 58 05.5960382376 -69 27 15.480133020   14.72 13.457 13.01 12.299 ~ 68 0
25 SV* HV 2260 cC* 05 00 55.8717251064 -68 26 20.815577988   15.67 14.906 14.35 13.933 ~ 51 0
26 SV* HV 2294 cC* 05 06 14.8080123792 -66 40 45.907786884   12.66 12.15 12.44 11.830 F7I 91 0
27 SV* HV 2352 cC* 05 09 04.3684805616 -70 21 54.126143748   14.86 14.197 13.74 13.38 ~ 47 0
28 SV* HV 2337 cC* 05 09 36.9600213408 -68 02 43.661029272     15.050   14.291 ~ 31 0
29 SV* HV 2369 cC* 05 13 53.6706712704 -67 03 48.446510436 14.7 12.88 12.21   11.648 F5?I? 77 0
30 SV* HV 2405 cC* 05 14 41.5551364872 -70 42 32.084016804   15.88 15.151 14.70 14.355 ~ 36 0
31 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
32 SV* HV 971 cC* 05 28 15.6248442624 -67 03 58.386086316   14.95 14.48 14.08 13.73 ~ 37 0
33 SV* HV 2580 cC* 05 29 25.6115975616 -66 14 23.293778244   14.82 14.01 13.53 13.14 ~ 50 0
34 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
35 SV* HV 997 cC* 05 33 00.9894859776 -68 11 27.619585692   15.46 14.591 14.20 13.635 ~ 44 0
36 * bet Dor cC* 05 33 37.5159729864 -62 29 23.376457680 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 401 0
37 SV* HV 2733 cC* 05 37 17.3553993120 -66 45 11.912453064   15.28 14.68 14.30 13.96 ~ 38 0
38 SV* HV 1013 cC* 05 39 53.6437371816 -67 50 08.784453804       13.68 12.771 ~ 41 0
39 SV* HV 2793 cC* 05 41 48.5455187616 -68 41 16.103127012     14.089   13.047 M 45 0
40 SV* HV 2827 cC* 05 43 47.3076015504 -66 35 08.943397872   13.37 12.02   11.220 M 67 0
41 SV* HV 2836 cC* 05 45 09.9518494872 -67 23 09.013994376   15.56 14.63 14.07 13.55 ~ 39 0
42 V* EU Tau cC* 05 45 40.5288555072 +18 39 24.819950988   8.71 8.08     G5 126 0
43 SV* HV 1023 cC* 05 46 36.1848254832 -68 11 03.439255668   14.66   13.52 12.775 ~ 51 0
44 SV* HV 2864 cC* 05 49 40.1566056984 -67 00 27.816301008   15.00 14.683   13.838 ~ 32 0
45 SV* HV 12700 cC* 05 57 31.5186721872 -67 37 29.437481028   15.68 14.86 14.49 14.11 ~ 39 0
46 SV* HV 6093 cC* 05 57 46.8445419408 -68 41 04.285724352   15.96 15.304 15.02 14.628 ~ 36 0
47 V* T Mon cC* 06 25 12.9996760920 +07 05 08.558582892 8.24 7.20 5.98   4.996 G3Iabv+A0p 487 1
48 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 596 0
49 V* X Pup cC* 07 32 47.0329137816 -20 54 34.884361152   9.56 8.46   7.143 K0 196 0
50 V* VZ Pup cC* 07 38 35.2380326136 -28 29 58.597431036   11.469 10.154 9.583   F7.5 165 1
51 V* AP Pup cC* 07 57 45.6725424768 -40 07 24.082195800   8.13 7.37   6.462 F8II 139 0
52 V* AQ Pup cC* 07 58 22.0887499032 -29 07 48.338631084   9.70 8.54   7.175 F5-G2Ib 212 0
53 V* LS Pup cC* 07 58 59.2197041640 -29 18 28.358867700   11.75 10.59 9.88 8.933 ~ 107 0
54 V* BN Pup cC* 08 06 21.4750343856 -30 05 48.770958372   10.99 9.75 8.97 8.981 G4 140 0
55 V* AX Vel cC* 08 10 49.3236457224 -47 41 54.828934332   8.78 8.16     F6II 127 0
56 V* RS Pup cC* 08 13 04.2157111224 -34 34 42.696447852 8.89 8.51 7.04   5.453 F8Iab 365 0
57 V* V Car cC* 08 28 43.6940477208 -60 07 21.268842960   8.14 7.31   6.432 F8Ib/II 157 0
58 V* RZ Vel cC* 08 37 01.3028699904 -44 06 52.846248456   8.507 7.260     G1Ib 240 0
59 V* T Vel cC* 08 37 40.8266515248 -47 21 43.084440432   8.92 7.68   6.970 G0II 182 0
60 V* SW Vel cC* 08 43 38.6903528472 -47 24 11.200999464   9.58 8.32     F8/G0Ib 198 0
61 V* SX Vel cC* 08 44 53.4685905720 -46 20 34.736412696   9.19 8.33   7.264 F8II 147 0
62 V* RY Vel cC* 10 20 41.0315888064 -55 19 17.028180084   9.71 7.86   6.840 F5Ib/II 163 0
63 * L Car * 10 22 58.1465809448 -66 54 05.385596996 4.35 4.86 4.99     B8V 120 0
64 V* WZ Car cC* 10 55 18.7271183664 -60 56 23.951331672   10.40 9.37     F8 164 0
65 V* U Car cC* 10 57 48.1866744768 -59 43 55.883482140 8.31 7.21 6.11   5.073 G5/8Iab 247 0
66 V* UU Mus cC* 11 52 17.7227171832 -65 24 15.063278652   10.5 9.54     F7/G0p 146 0
67 V* S Mus cC* 12 12 47.0199008472 -70 09 06.439196664 7.58 8.80 8.33 7.39 5.196 F6Ib+B5V 275 0
68 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
69 V* VW Cen cC* 13 33 59.0300715216 -64 03 19.999348524   11.60 10.36   8.785 ~ 137 0
70 V* KN Cen cC* 13 36 36.8950655064 -64 33 29.914949592   11.22 9.86     G8Iab+B6.0V 157 0
71 V* XX Cen cC* 13 40 18.6439597656 -57 36 47.440376532   8.72 7.30   6.747 F7/8II 205 0
72 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
73 V* V Cen cC* 14 32 33.0833481288 -56 53 15.774129600 8.44 7.84 6.93   5.798 F5Ib/II 288 0
74 V* GH Lup cC* 15 24 38.3402056752 -52 51 13.897364040 10.03 9.05 7.83     G2Iab 110 0
75 V* U Nor cC* 15 42 20.9185773096 -55 18 42.939346104   10.68 9.22     F8Ib/II 160 0
76 V* S Nor cC* 16 18 51.8316855000 -57 53 59.256000852 8.15 7.49 6.49   5.427 F8/G0Ib 396 1
77 V* KQ Sco cC* 16 51 38.5473559392 -45 25 36.101286516 12.37 10.69 9.31     K7 149 0

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