1994A&AS..106..419M

Query : 1994A&AS..106..419M

1994A&AS..106..419M - Astron. Astrophys., Suppl. Ser., 106, 419-426 (1994/September-0)

UBV photoelectric photometry of red giants in NGC 6939.

MERMILLIOD J.-C., HUESTAMENDIA G. and DEL RIO G.

Abstract (from CDS):

UBV photoelectric photometry has been obtained for 37 red giant stars in the intermediate-age open cluster NGC 6939 to study the morphology of the red giant branch in the colour-magnitude diagram. NGC 6939 presents a prominent clump. A second and fainter concentration is observed and should correspond to the slow-down of the evolution along the red giant branch occurring when the H-burning shell reaches the chemical composition discontinuity. Comparisons with isochrones and theoretical distribution functions along the red giant branch are not fully satisfactory. The canonical models from Castellani et al. (1992) produce a good agreement with the slope of the giant branch and width of the clump, but predict too many red giants in the lower part of the ascending giant branch, while the models with overshooting of Bressan et al. (1993) and Schaller et al. (1992) give probably better predictions.

Abstract Copyright: ∼

Journal keyword(s): clusters: open: NGC 6939 - stars: red giant: evolution - HR diagram

Nomenclature: Table 1: NGC 6939 NNN N=9 among (Nos 435-489) added.

Simbad objects: 48

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Number of rows : 48
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 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
2 NGC 2360 OpC 07 17 45.8 -15 38 21           ~ 213 0
3 NGC 6134 OpC 16 27 48.5 -49 09 40   7.89 7.2     ~ 166 0
4 IC 4651 OpC 17 24 48.5 -49 55 23           ~ 374 0
5 NGC 6939 36 * 20 30 46.5435968808 +60 41 26.053324188   13.25 12.31 12.55   ~ 4 0
6 NGC 6939 53 * 20 31 01.6 +60 42 14   14.16 12.86     ~ 7 0
7 2MASS J20310597+6042139 RG* 20 31 05.9725006344 +60 42 13.823912016   13.85 12.55     ~ 13 0
8 NGC 6939 114 * 20 31 21.8938057200 +60 45 47.154587796           ~ 9 0
9 NGC 6939 121 * 20 31 24.3038962824 +60 37 43.127551776   13.50 12.41     ~ 17 0
10 2MASS J20312540+6041164 RG* 20 31 25.4128372560 +60 41 16.423989504   14.35 13.10     ~ 13 0
11 2MASS J20312693+6036595 RG* 20 31 26.9354382864 +60 36 59.422691160   13.78 12.27     ~ 10 0
12 V* V469 Cep LP? 20 31 27.0686766888 +60 38 17.841704676   14.24       ~ 9 0
13 NGC 6939 135 * 20 31 27.1425385272 +60 38 50.967426660   13.69 12.58     ~ 9 0
14 NGC 6939 144 * 20 31 27.6 +60 45 41   14.67 13.32     G8V 5 0
15 NGC 6939 146 * 20 31 28.2752880624 +60 43 11.009226612   14.64 13.34     ~ 9 0
16 NGC 6939 141 * 20 31 28.3369289376 +60 37 02.684235072   14.67 13.12     ~ 7 0
17 NGC 6939 145 * 20 31 28.5293826000 +60 40 07.538515572   14.36 13.05     ~ 13 0
18 2MASS J20313200+6039271 RG* 20 31 32.0140172184 +60 39 27.077328504   14.47 13.13     ~ 14 0
19 2MASS J20313338+6045507 RG* 20 31 33.3846551808 +60 45 50.652291708   14.42 13.07     ~ 10 0
20 NGC 6939 182 * 20 31 34.4875422168 +60 39 06.107373756   14.29 12.92     ~ 9 0
21 NGC 6939 185 * 20 31 36.5121563232 +60 35 21.428909232   13.42 12.21     ~ 10 0
22 NGC 6939 214 * 20 31 40.1641759152 +60 41 31.422180192   14.27 13.00     ~ 15 0
23 2MASS J20314054+6037084 RG* 20 31 40.5499836264 +60 37 08.207863428   13.72 12.03     ~ 19 0
24 NGC 6939 OpC 20 31 40.6 +60 38 54           ~ 171 0
25 2MASS J20314339+6040386 RG* 20 31 43.3985941032 +60 40 38.518351536   14.22 12.90     ~ 15 0
26 NGC 6939 292 * 20 31 59.0930315376 +60 42 04.462553448   14.55 13.19     ~ 14 0
27 2MASS J20315931+6041075 RG* 20 31 59.3207506656 +60 41 07.485085464   14.53 13.19     ~ 10 0
28 NGC 6939 311 SB* 20 32 06.4406340216 +60 42 21.566527308   14.62 13.28     ~ 5 0
29 2MASS J20320790+6044167 RG* 20 32 07.9135954944 +60 44 16.644953436   14.82 13.36     ~ 10 0
30 NGC 6939 333 RG* 20 32 21.7257844800 +60 43 11.316426924   14.04 12.36     ~ 12 0
31 NGC 6939 355 * 20 32 22.6406207496 +60 41 20.328530028   14.09 12.35     ~ 4 0
32 NGC 6939 489 * ~ ~   13.56 11.89     ~ 1 0
33 NGC 6939 485 * ~ ~   15.18 13.81     ~ 1 0
34 NGC 6939 467 * ~ ~   13.39 11.76     ~ 1 0
35 NGC 6939 463 * ~ ~   14.00 12.01     ~ 1 0
36 NGC 6939 457 * ~ ~   14.96 13.52     ~ 1 0
37 NGC 6939 448 * ~ ~   14.59 13.36     ~ 1 0
38 NGC 6939 447 * ~ ~   13.69 12.69     ~ 1 0
39 NGC 6939 443 * ~ ~   13.73 12.43     ~ 1 0
40 NGC 6939 435 * ~ ~   13.65 12.19     ~ 1 0
41 NGC 6939 364 * ~ ~   13.83 12.18     ~ 1 0
42 NGC 6939 362 * ~ ~   14.22 12.80     ~ 2 0
43 NGC 6939 357 * ~ ~   14.46 13.08     ~ 1 0
44 NGC 6939 337 * ~ ~   14.67 13.25     ~ 1 0
45 NGC 6939 143 * ~ ~   13.29 11.92     ~ 2 0
46 NGC 6939 32 * ~ ~   15.05 13.65     ~ 1 0
47 NGC 6939 31 * ~ ~   12.99 11.16     ~ 6 0
48 NGC 6939 3 * ~ ~   13.89 12.31     ~ 1 0

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