2000A&A...356L..37A


Query : 2000A&A...356L..37A

2000A&A...356L..37A - Astronomy and Astrophysics, volume 356, L37-40 (2000/4-2)

Metallicity effects on the light curve shape of Cepheids with period close to 10 days.

ANTONELLO E., FUGAZZA D. and MANTEGAZZA L.

Abstract (from CDS):

The light curves of population I classical Cepheids with period P in the range between 5 and 13 days in the very metal poor irregular galaxy IC 1613 have been analyzed and compared with those of Cepheids in the Galaxy. Even if there are few Cepheids in this period range in IC 1613, the results are of some importance for the (presently unsuccessful) attempts to reproduce the observed light curves with nonlinear models for low metal content Z. Looking at the shape, there is a general similarity of the light curves in both galaxies, even if Z∼0.02 for Galaxy and ∼0.001 for IC 1613, but the same shape occurs in different period ranges. The theoretically predicted sensitivity of Fourier parameters to Z is apparently confirmed just in part by IC 1613 Cepheids, since the observed parameters are compatible with purely radiative model results, but for Z larger than 0.01. A comparison with SMC Cepheids (Z∼0.005) indicates that the partial compatibility could be just apparent owing to the poor number of stars; if this was true, the failure of nonlinear models would be an even more serious problem than it is presently deemed.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: variables: Cepheids - galaxies: individual: IC 1613 - galaxies: Local Group - galaxies: stellar content

Nomenclature: Table 1: [AFM2000] VNNNN-A N=16.

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10197 1
2 [AFF2006] 1323-3 Ce* 01 04 33.69 +02 07 45.3   20.89 20.296 19.91 19.64 ~ 10 0
3 [AFF2006] 1046-3 Ce* 01 04 34.54 +02 06 42.1   20.84 20.241 19.88 19.60 ~ 7 0
4 [AFF2006] 0193-2 Ce* 01 04 40.31 +02 01 24.5   21.26 20.680 20.31 20.06 ~ 7 0
5 [AFF2006] 0127-2 Ce* 01 04 43.93 +02 01 04.4   21.59 20.994 20.50 20.29 ~ 7 0
6 [AFF2006] 6628-2 Ce* 01 04 44.34 +02 05 29.0   21.15 20.284 19.82 19.45 ~ 8 0
7 [AFF2006] 7651-2 Ce* 01 04 51.20 +02 04 44.5   21.36 20.79 20.51 20.35 ~ 6 0
8 [AFF2006] 1481-2 Ce* 01 04 51.61 +02 05 33.2   21.41 20.729 20.26 19.99 ~ 8 0
9 [SHM2017] J016.21524+02.18203 Ce* 01 04 51.6658985808 +02 10 55.414018884   20.97 20.502 20.24 19.96 ~ 10 0
10 [AFF2006] 4175-2 Ce* 01 04 51.70 +02 10 10.2   21.12 20.685 20.35 20.17 ~ 8 0
11 [UWP2001] 13759 Ce* 01 04 52.61 +02 08 04.5   21.25     19.987 ~ 7 0
12 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1166 2
13 [AFF2006] 3171-2 Ce* 01 04 56.35 +02 08 21.3   21.60 20.991 20.56 20.37 ~ 9 0
14 [AFM2000] V0107-A Ce* 01 04 57.0 +02 08 37           ~ 3 0
15 [AFF2006] 3384-2 Ce* 01 04 59.84 +02 08 42.8   21.62 20.90 20.48 20.19 ~ 8 0
16 [AFM2000] V2221-A Ce* 01 05 04.7 +02 08 47           ~ 3 0
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15993 1
18 V* AC Mon cC* 07 00 59.8200543168 -08 42 32.370161148   11.37 10.29     F5 80 0
19 V* WX Pup cC* 07 41 59.0037418728 -25 52 34.252471632   9.99 9.09   7.944 G0 106 0
20 V* S Nor cC* 16 18 51.8316855000 -57 53 59.256000852 8.15 7.49 6.49   5.427 F8/G0Ib 360 1
21 V* V500 Sco cC* 17 48 37.5008772936 -30 28 33.459985200   10.07 8.81   7.191 K0 120 0
22 * gam01 Sgr cC* 18 05 01.2264355704 -29 34 48.322222356 5.99 5.47 4.69   3.869 G0Ib/II 338 0
23 V* YZ Sgr cC* 18 49 28.5890872992 -16 43 22.896000948 8.49 7.91 7.02   6.207 G2Ib 163 0
24 V* FN Aql cC* 19 12 47.3148920688 +03 33 26.703677448   9.58 7.96     F8/G0Iab/b 178 0
25 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1496 0
26 V* V347 Cyg cC* 20 51 26.5747045200 +46 07 15.776375160   14.21 12.29     ~ 27 0
27 NAME Local Group GrG ~ ~           ~ 7638 0
28 [AFM2000] V0016-B Ce* ~ ~           ~ 1 0

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2022.05.23-23:15:55

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