2001A&A...367..831U

Query : 2001A&A...367..831U

2001A&A...367..831U - Astronomy and Astrophysics, volume 367831-839 (2001/3-1)

Spectroscopic investigations of classical cepheids and main-sequence stars in galactic open clusters and associations. I. Association Cas OB2 and the small-amplitude cepheid SU Cassiopeae.

USENKO I.A., KOVTYUKH V.V., KLOCHKOVA V.G., PANCHUK V.E. and YERMAKOV S.V.

Abstract (from CDS):

The small-amplitude Cepheid SU Cas and four members of the association Cas OB2 (HD 16893, HD 17327a and b, HD 17443) were investigated, using high-resolution CCD spectra. The following results were obtained: 1) All these objects have the same metallicity values, close to that of the Sun; 2) Elemental abundance indicates that SU Cas is a post first dredge-up star with an age from 1x108 to 1.45x108yr, and it is not crossing the Cepheid instability strip for the first time. The mean value of logg=2.35 corresponds to pulsations in the fundamental tone, although errors in gravity estimations provide overtone pulsations. The questions about its pulsational mode and membership in Cas OB2 remained open; 3) HD 17327a is a slowly rotating HgMn-star with the highest helium content among such objects, while HD 16893 also has a manganese overabundance and might be classified as an Am-star; 4) HD 17327b and HD 17443 are rapidly rotating main-sequence stars, while HD 17443 has a helium content comparable with that of the Sun.

Abstract Copyright: ∼

Journal keyword(s): associations - stars: abundances - stars: Cepheids - stars: main-sequence

CDS comments: Table 1: objects Sco OBa, and OBanon, not identified

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 V* CG Cas cC* 00 00 59.2385245512 +60 57 32.432852268   12.70 11.28     F5 113 0
2 V* DL Cas cC* 00 29 58.5888773064 +60 12 43.065292140 10.66 9.88 8.63   7.582 G1Ib-IIHdel-1 349 0
3 NGC 129 OpC 00 30 25.8 +60 12 44   7.33 6.5     ~ 216 0
4 V* VY Cas AB* 00 51 26.0014485360 +62 55 14.872790748   10.94 9.62     M6/7III 60 0
5 NGC 663 OpC 01 46 22.2 +61 12 53   7.78 7.1     ~ 269 0
6 V* BY Cas cC* 01 47 11.9194002672 +61 25 20.954139708   11.5 10.369     F5 132 0
7 V* VX Per cC* 02 07 48.4808945496 +58 26 36.741616512   10.47 9.37   7.927 G2IV 198 0
8 Ass Per OB 1 As* 02 21 +57.6           ~ 181 1
9 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
10 V* V440 Per cC* 02 23 51.7443704208 +55 21 53.502677352 7.76 7.120 6.291     F8Ib-II 195 0
11 V* SZ Cas cC* 02 27 13.7668799784 +59 27 38.174272524   11.5 9.60     G5III 182 0
12 V* VY Per cC* 02 27 35.4625776432 +58 55 01.760379168   12.48 11.32   9.246 F7.5Ib 115 0
13 V* UY Per cC* 02 34 31.3002163512 +58 49 53.842491876   12.46 11.18   9.431 F7 133 0
14 Cl King 4 OpC 02 36 07.1 +59 01 52   11.42 10.5     ~ 49 0
15 HD 16893 * 02 45 59.5047164136 +67 48 31.080991248   8.88 8.55     A2 11 0
16 HD 17327 * 02 49 58.1343194288 +64 37 50.869483142 7.7 7.82 7.50 8.38   B8II-III 34 1
17 HD 17327B * 02 49 58.2843151248 +64 37 45.683172480   10.72 10.29     ~ 3 0
18 HD 17443 * 02 51 32.7706770144 +67 48 54.157444632   9.04 8.75     B9V 44 2
19 V* SU Cas cC* 02 51 58.7511911208 +68 53 18.606894036 6.92 6.44 5.80     F5.5III+ 444 1
20 HD 17706 ** 02 53 40.4905315272 +64 27 07.142055444   6.312 6.408 7.60   B5IV 36 0
21 V* BE Cam LP* 03 49 31.2775482648 +65 31 33.525822504 8.49 6.36 4.48 2.77 1.35 M2II 121 0
22 V* SZ Tau cC* 04 37 14.7776556504 +18 32 34.926940860 7.65 7.13 6.37     F6.7:Ib 316 0
23 NGC 1647 OpC 04 46 00.4 +19 05 06   6.82 6.4     ~ 189 0
24 V* T Mon cC* 06 25 12.9996760920 +07 05 08.558582892 8.24 7.20 5.98   4.996 G3Iabv+A0p 487 1
25 NAME Rosette OB Association As* 06 31.7 +04 58           ~ 148 0
26 V* CV Mon cC* 06 37 04.8449178072 +03 03 50.274557532   11.32 9.90   8.631 ~ 254 0
27 V* AC Mon cC* 07 00 59.8200543168 -08 42 32.370161148   11.37 10.29     F5 95 0
28 NGC 2323 OpC 07 02 47.3 -08 22 07           ~ 212 0
29 Ass Pup OB 2 As* 07 57 -27.5           ~ 22 0
30 Cl Collinder 173 OpC 08 02 49.00 -46 23 00.0           ~ 35 0
31 V* AH Vel cC* 08 11 59.9667243312 -46 38 39.658236936   6.35 5.76     F7Ib/II 186 0
32 V* RS Pup cC* 08 13 04.2157111224 -34 34 42.696447852 8.89 8.51 7.04   5.453 F8Iab 365 0
33 Ass Pup OB 3 As* 08 18.1 -35 46           ~ 26 0
34 V* RZ Vel cC* 08 37 01.3028699904 -44 06 52.846248456   8.507 7.260     G1Ib 240 0
35 V* SW Vel cC* 08 43 38.6903528472 -47 24 11.200999464   9.58 8.32     F8/G0Ib 198 0
36 Ass Vel OB 1 As* 08 49.9 -45 00           ~ 104 0
37 V* CS Vel cC* 09 41 10.2609376392 -53 48 57.785105952   12.46 11.24   10.078 ~ 126 0
38 V* AQ Car cC* 10 21 22.9751846448 -61 04 26.737119948   9.73 8.84     F8/G0Ib 129 0
39 V* U Car cC* 10 57 48.1866744768 -59 43 55.883482140 8.31 7.21 6.11   5.073 G5/8Iab 247 0
40 Ass Car OB 2 As* 11 08 -60.2           ~ 84 0
41 V* V Cen cC* 14 32 33.0833481288 -56 53 15.774129600 8.44 7.84 6.93   5.798 F5Ib/II 288 0
42 NGC 5662 OpC 14 34 55.5 -56 40 41   6.18 5.5     ~ 136 0
43 Cl Lynga 6 OpC 16 04 50.7 -51 57 19   10.28 9.5     ~ 95 0
44 V* TW Nor cC* 16 04 55.2261513912 -51 57 12.653328096   13.67 11.17     ~ 171 0
45 V* QZ Nor cC* 16 11 20.4664528848 -54 21 14.824796688 10.08 9.53 8.71 8.66   G1Iab 154 0
46 NGC 6067 OpC 16 13 10.2 -54 13 48           ~ 239 0
47 V* V340 Nor cC* 16 13 17.3997630552 -54 14 05.586545400   9.61 8.47 8.83   G2Iab 175 1
48 V* GU Nor cC* 16 14 54.7528732104 -53 20 18.344138928   11.60 10.08   8.802 ~ 106 0
49 V* S Nor cC* 16 18 51.8316855000 -57 53 59.256000852 8.15 7.49 6.49   5.427 F8/G0Ib 396 1
50 NGC 6087 OpC 16 18 55.7 -57 53 32           ~ 198 0
51 V* KQ Sco cC* 16 51 38.5473559392 -45 25 36.101286516 12.37 10.69 9.31     K7 149 0
52 NGC 6449 AG? 17 43 46.3282463256 +56 48 14.816523780   14.6       ~ 21 0
53 C 1814-191 OpC 18 14.3 -19 06           ~ 3 1
54 V* WZ Sgr cC* 18 16 59.7160721616 -19 04 32.989734840   9.10 7.45     F7(III) 270 0
55 IC 4725 OpC 18 31 47.5 -19 07 37           ~ 239 0
56 V* U Sgr cC* 18 31 53.3323107600 -19 07 30.261459540 8.50 7.81 6.68   5.413 G1Ib 491 0
57 V* V367 Sct cC* 18 33 35.2353033192 -10 25 38.126250552   13.34 11.580     F7Ib 187 0
58 NGC 6664 OpC 18 36 32.4 -08 11 23   8.81 7.8     ~ 135 0
59 V* EV Sct cC* 18 36 39.6017483712 -08 11 05.361288684   10.99 9.90     F8Ib 267 0
60 V* RU Sct cC* 18 41 56.3818572048 -04 06 38.376404820   10.17 8.82     G5 216 0
61 Cl Trumpler 35 OpC 18 42 57.9 -04 13 21   10.44 9.2     ~ 79 0
62 V* BB Sgr cC* 18 50 59.8729954248 -20 17 42.829838520 8.07 7.53 6.69   5.824 G0Ib 269 0
63 Cl Collinder 394 OpC 18 52 34.9 -20 10 39     6.3     ~ 96 0
64 V* GY Sge cC* 19 35 13.6269237552 +19 12 08.669232720 13.62 12.116 9.886 9.633   ~ 124 0
65 Ass Vul OB 1 As* 19 44.0 +24 13           ~ 100 0
66 Ass Vul OB 2 As* 19 47.6 +28 49           ~ 28 0
67 V* S Vul cC* 19 48 23.8063718736 +27 17 11.428754460   11.392 9.551 8.775   K0 211 0
68 V* SV Vul cC* 19 51 30.9059845128 +27 27 36.837672012 8.65 9.00 6.74   5.703 F8Ia 460 0
69 V* V1726 Cyg cC* 21 29 38.9418445224 +48 58 08.707807488   9.76 8.91     F5 80 1
70 Cl Platais 1 OpC 21 30 02 +48 58.6           ~ 30 2
71 V* IR Cep cC* 21 57 51.9253905744 +61 01 07.906978452   8.68 7.86     G0 107 0
72 Ass Cas OB 2 As* 23 20 +60.9           ~ 69 0
73 V* CE Cas B cC* 23 58 09.1062438336 +61 12 49.078923084   12.27 11.20     F8Ib 52 0
74 V* CE Cas A cC* 23 58 09.4463569272 +61 12 49.336242768   12.15 10.95     F9Ib 59 0
75 V* CF Cas cC* 23 58 17.9760671064 +61 13 15.821693832   12.72 10.80   9.700 F8Ibv 256 0
76 NGC 7790 OpC 23 58 27.6 +61 12 33   9.18 8.5     ~ 286 0
77 Ass Vel OB 5 As* ~ ~           ~ 9 0

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