2004AJ....128.2988S

Query : 2004AJ....128.2988S

2004AJ....128.2988S - Astron. J., 128, 2988-2996 (2004/December-0)

The spectra of type II cepheids. III. The Hα line and helium emission in long-period stars.

SCHMIDT E.G., JOHNSTON D., LEE K.M., LANGAN S., NEWMAN P.R. and SNEDDEN S.A.

Abstract (from CDS):

We have obtained Hα profiles from 175 spectra of 37 Cepheids with periods longer than 8 days. About two-thirds of the stars are likely type II Cepheids. In contrast to the situation among short-period stars, the velocity of Hα relative to the metal-line spectrum is not a useful parameter for distinguishing type I and type II Cepheids. On the other hand, at periods longer than 11 days and shorter than 34 days strong emission is observed in many stars and appears to be a good discriminator of type. On this basis we identify one probable type I Cepheid at a large distance from the Galactic plane. We have found He λ5876 emission in seven Cepheids among the long-period stars discussed here and in one star with a short period, bringing to nine the number of type II Cepheids known to exhibit He emission.

Abstract Copyright: ∼

Journal keyword(s): Stars: Variables: Cepheids - Stars: Population II

Simbad objects: 38

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Number of rows : 38
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* IX Cas WV* 00 04 50.8165981056 +50 14 05.540024148   12.04 11.36     F7 61 0
2 V* QQ Per WV* 02 54 40.3970679768 +51 49 28.674468732   14.433 13.577 13.556   ~ 31 0
3 V* AD Cam cC* 03 29 25.9697779560 +60 26 47.271788232   14.16       ~ 54 0
4 V* OT Per cC* 04 38 37.9383938232 +47 44 25.007509824   15.71 13.47     ~ 44 0
5 V* AN Aur cC* 04 59 41.5376124792 +40 50 09.726015408   11.35 10.21     F6 103 0
6 V* SZ Mon pA* 06 51 27.8476503456 -01 22 15.965715072   10.996 10.259 9.910 9.109 F8(e) 69 1
7 V* W Vir WV* 13 26 01.9928807928 -03 22 43.431062880   10.33 9.46 9.29 9.393 F2Ibe 300 0
8 V* AL Vir WV* 14 11 09.0461976912 -13 18 38.439874440   10.13 9.10     F3/5III 86 0
9 V* V845 Her cC* 16 25 16.3008635496 +40 53 48.724486836   9.70 13.38 12.45   ~ 12 0
10 V* V775 Oph cC* 17 32 40.4104045680 +07 42 20.249829936           ~ 13 0
11 V* V833 Oph WV* 17 50 17.5467039768 +11 38 25.826438076           ~ 11 0
12 V* V478 Oph WV* 17 59 38.9857077192 +00 47 09.019503312           ~ 29 0
13 V* BH Oph WV* 18 15 50.5427626872 +12 05 44.083532184   12.29 11.84     F7.2e 27 0
14 V* CC Lyr WV* 18 33 57.4123406832 +31 38 24.187157196   12.98 12.46     hF4mA:CH+1 51 0
15 V* AP Her WV* 18 50 27.7290127008 +15 56 24.669429612 12.09 11.33 10.87     F2Ib/II 65 0
16 V* PZ Aql WV* 18 55 56.0446326720 -02 52 47.035601220   13.13 11.79     F5 29 0
17 V* V801 Aql cC* 18 58 58.2468183696 -06 30 45.661499028         12.082 ~ 13 0
18 V* EV Aql cC* 19 06 46.1545028640 +14 55 46.259364180   12.95 11.63     ~ 52 0
19 V* V916 Aql cC* 19 10 00.4156127256 +12 32 11.608198908   12.22 10.86   8.908 ~ 55 1
20 V* AL Lyr WV* 19 19 29.6172143976 +27 33 44.438357556   12.95 11.98     ~ 24 0
21 V* NN Vul RV* 19 29 53.9882770800 +25 14 57.003096084   15.69 14.18 13.85   ~ 9 0
22 V* ET Vul cC* 19 35 20.1037999728 +26 25 48.871371072   13.84 12.19 11.82   ~ 22 0
23 V* V1281 Aql WV* 19 43 19.2134135926 -00 21 33.165494145           ~ 8 0
24 V* AS Vul cC* 19 47 44.4704348496 +27 55 05.704733136   14.13       ~ 38 0
25 V* IU Cyg RV* 19 50 08.2476953712 +34 09 57.584175552   15.215 14.049 12.874 12.025 ~ 26 0
26 V* EU Cyg cC* 19 51 17.2841825976 +32 40 31.962586044   14.60       ~ 38 0
27 V* PP Aql WV* 19 52 46.5486674448 +12 40 09.002477712   13.00 12.11 11.10   ~ 26 0
28 V* EZ Cyg cC* 19 57 49.0090610088 +30 15 57.295666656   12.45 11.21     G5V 50 0
29 V* V343 Cyg cC* 20 04 04.4822556840 +39 06 15.204333420   14.30     11.429 F6 37 0
30 V* TW Cap RV* 20 14 28.4158961112 -13 50 07.884309192   11.660 10.862 10.292   F4Ib 75 0
31 V* KX Cyg cC* 20 24 19.3460912592 +40 33 39.915429300   14.14 11.72 10.71   ~ 49 0
32 V* DR Cep cC* 20 49 05.5864344744 +58 53 57.167884356     13.08     F5p 37 0
33 V* MZ Cyg WV* 21 21 54.7238681664 +37 27 33.101250912   13.16 12.14     G1 44 0
34 V* V609 Cyg cC* 21 26 56.0224273104 +54 29 29.237656272   13.27 10.80   8.703 ~ 57 1
35 V* CP Cep cC* 21 57 52.6912593888 +56 09 50.041033668   12.29 10.58   8.788 F5Ib 111 0
36 V* CH Cas cC* 23 22 28.4389674024 +62 45 25.742896416   12.57 10.79     F3Ibp 79 0
37 V* CN Cep cC* 23 25 34.7917689960 +64 47 25.504138932   14.18       ~ 38 0
38 V* CS Cas WV* 23 50 14.2576216656 +51 23 58.767943344   12.02       ~ 27 0

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