2009A&A...493...79M


Query : 2009A&A...493...79M

2009A&A...493...79M - Astronomy and Astrophysics, volume 493, 79-88 (2009/1-1)

The open cluster Pismis 11 and the very luminous blue supergiant HD 80077. I. Physical parameters of the cluster.

MARCO A. and NEGUERUELA I.

Abstract (from CDS):

The very luminous blue supergiant HD 80077 has been claimed to be a member of the young open cluster Pismis 11, and hence a hypergiant. Membership of the cluster would mean that it is one of the brightest stars in the Galaxy, and one of the few evolved very massive stars whose distance can be accurately determined. We carry out a comprehensive study of the open cluster Pismis 11, which allows us to derive with accuracy its distance and reddening. We obtained UBVRI photometry of the cluster field and low-resolution spectroscopy of a number of putative members. We derive spectral types from the spectra and determine that the reddening in this direction is standard. We then carry out a careful photometric analysis that allows us to determine individual reddening values, deriving unreddened parameters that are used for the main sequence fit. We identify 43 likely members of Pismis 11 and determine individual reddenings. We study the variation of extinction across the face of the cluster and find some dispersion, with a trend to higher values in the immediate neighbourhood of HD 80077. We estimate a distance of 3.6kpc for the cluster. If HD 80077 is a member, it has Mbol←10.5 and it is one of the three visually brightest stars in the Galaxy. Several early type stars in the vicinity of Pismis 11 fit well the cluster sequence and are likely to represent an extended population at the same distance. About 18' to the North of Pismis 11, we find a small concentration of stars, which form a clear sequence. We identify this group as a previously uncatalogued open cluster, which we provisionally call Alicante 5. The distance to Alicante 5 is also 3.6kpc, suggesting that these two clusters and neighbouring early-type stars form a small association. We have identified a small association around Pismis 11, located at a distance of 3.6kpc. Based on its proper motion, HD 80077 is not a runaway star and may be a member of the cluster. If this is the case, it would be one of the brightest stars in the Galaxy.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Pismis 11 - stars: Hertzsprung-Russell (HR) and C-M diagrams - stars: early-type

VizieR on-line data: <Available at CDS (J/A+A/493/79): table2.dat table3.dat table5.dat table6.dat table8.dat table9.dat>

Nomenclature: Paragr.2.2: Cl Alicante N (No. 5). Table 2: Cl* Pismis 11 MN NNN N=145 among (Nos 1-147). Table 5: Cl* Alicante 5 MN NNN (Nos 1-105).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

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 - 2022
#notes
1 * chi02 Ori s*b 06 03 55.1843706432 +20 08 18.428141364 4.24 4.91 4.63 4.32 4.10 B2Ia 438 0
2 SA 98- reg 06 52 04.1 -00 23 58           ~ 171 0
3 Ass Vel OB 1 As* 08 49.9 -45 00           ~ 96 0
4 CD-49 4248 * 09 15 05.2215054000 -49 44 13.739179848 11.68 11.98 11.16 11.01   OB 14 0
5 Cl Pismis 11 13 * 09 15 30.9948407976 -50 02 20.732540892 12.64 12.88 12.03 11.84   OB 8 0
6 TYC 8174-1072-1 * 09 15 33.6800548080 -49 48 05.957625816   12.67 12.25     OB- 3 0
7 Cl Pismis 11 9 * 09 15 51.7486818792 -50 01 41.256680268 14.056 14.22 13.31     B1.5Vn 8 0
8 Cl Pismis 11 6 * 09 15 52.0277518224 -50 02 38.471349984 13.753 13.86 12.91     B1V 7 0
9 CD-49 4263 * 09 15 52.7893643880 -50 00 43.784843184 11.88 12.03 11.05 10.78   O7.5V((f)) 17 0
10 Cl Pismis 11 OpC 09 15 53.0 -50 01 00           ~ 26 1
11 Cl Pismis 11 4 * 09 15 54.1269696864 -50 00 24.996149892 13.459 13.62 12.64     B1V 7 0
12 HD 80077 s*b 09 15 54.7869062472 -49 58 24.575734452 10.50 10.29 9.00 7.89   B2Ia+e 134 0
13 USNO-B1.0 0399-00145111 * 09 15 56.0268411432 -50 05 20.215974444   14.4   12.9   ~ 1 0
14 CD-49 4265 * 09 15 56.6049677088 -49 45 04.106286252 11.51 11.77 10.84 10.60   OB+ 12 0
15 Cl Alicante 5 Cl* 09 16 23.0 -49 42 56           ~ 3 0
16 Cl* Alicante 5 A 47 * 09 16 29.7021214776 -49 42 49.277053908 14.627 14.463 13.259     B0.7V 2 0
17 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
18 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 319 0
19 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6250 0
20 V* BP Cru HXB 12 26 37.5605188992 -62 46 13.261044684   12.70 10.66     B1.5Iaeq 635 0
21 * zet01 Sco s*b 16 53 59.7271314888 -42 21 43.307334468 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 361 0
22 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12914 0
23 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Iaep 181 1
24 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 393 0

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2022.05.26-23:54:30

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