2013ApJ...777...35L

Query : 2013ApJ...777...35L

2013ApJ...777...35L - Astrophys. J., 777, 35 (2013/November-1)

Properties of M31. III. Candidate beat cepheids from PS1 PAndromeda data and their implication on metallicity gradient.

LEE C.-H., KODRIC M., SEITZ S., RIFFESER A., KOPPENHOEFER J., BENDER R., HOPP U., GOSSL C., SNIGULA J., BURGETT W.S., CHAMBERS K.C., FLEWELLING H., HODAPP K.W., KAISER N., KUDRITZKI R.-P., PRICE P.A., TONRY J.L. and WAINSCOAT R.J.

Abstract (from CDS):

We present a sample of M31 beat Cepheids from the Pan-STARRS 1 PAndromeda campaign. By analyzing 3 years of PAndromeda data, we identify 17 beat Cepheids, spreading over a galactocentric distance of 10-16 kpc. Since the relation between the fundamental mode period and the ratio of the fundamental to the first overtone period places a tight constraint on metallicity, we are able to derive the metallicity at the position of the beat Cepheids using the relations from the model of Buchler. Our metallicity estimates show sub-solar values within 15 kpc, similar to the metallicities from H II regions. We then use the metallicity estimates to calculate the metallicity gradient of the M31 disk, which we find to be closer to the metallicity gradient derived from planetary nebula than the metallicity gradient from H II regions.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: M31 - stars: variables: Cepheids

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 - 2026 		#notes
1 V* TU Cas cC* 00 26 19.4488112352 +51 16 49.292204088   8.507 7.835     F4 212 0
2 PSO J010.0031+40.6271 Ce* 00 40 00.75 +40 37 37.8     22.00     ~ 3 0
3 PSO J010.0289+40.6434 ? 00 40 06.94 +40 38 36.5           ~ 1 0
4 PSO J010.0908+40.8632 ? 00 40 21.80 +40 51 47.6           ~ 1 0
5 PSO J010.1097+41.1233 ? 00 40 26.34 +41 07 24.2           ~ 1 0
6 PSO J010.1601+41.0591 ? 00 40 38.44 +41 03 32.9           ~ 1 0
7 PSO J010.2081+40.5311 ? 00 40 49.97 +40 31 52.1           ~ 1 0
8 PSO J010.3333+41.2202 ? 00 41 19.99 +41 13 13.0           ~ 1 0
9 PSO J010.3431+40.8255 ? 00 41 22.34 +40 49 32.0           ~ 1 0
10 PSO J010.5507+40.8208 ? 00 42 12.17 +40 49 15.1           ~ 1 0
11 PSO J010.6215+41.4763 cC* 00 42 29.16482160 +41 28 34.9011840           ~ 2 0
12 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
13 [VRJ2006] M31V-J00432573+4143380 V* 00 43 25.7304 +41 43 38.064   22.05 21.59   20.69 ~ 4 0
14 [VRJ2006] M31V-J00450680+4153366 V* 00 45 06.8064 +41 53 36.636           ~ 2 0
15 [VRJ2006] M31V-J00452813+4145117 V* 00 45 28.1376 +41 45 11.772           ~ 4 0
16 [VRJ2006] M31V-J00453584+4140400 V* 00 45 35.8416 +41 40 40.044           ~ 2 0
17 PSO J011.4131+42.0052 ? 00 45 39.16 +42 00 19.0           ~ 1 0
18 PSO J011.4436+41.9044 ? 00 45 46.49 +41 54 16.1           ~ 1 0
19 PSO J011.4836+42.1621 cC* 00 45 56.07381120 +42 09 43.6572720           ~ 3 0
20 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
21 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
22 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
23 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
24 V* U TrA cC* 16 07 19.0044671808 -62 54 38.018675304   8.43 7.89     F8Ib/II 149 0

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