J/A+A/493/79 UBVRI photometry in Pismis 11 and Alicante 5 (Marco+, 2009)
The open cluster Pismis 11 and the very luminous blue supergiant HD 80077.
I. Physical parameters of the cluster.
Marco A., Negueruela I.
<Astron. Astrophys. 493, 79 (2009)>
=2009A&A...493...79M 2009A&A...493...79M
ADC_Keywords: Clusters, open ; Photometry, UBVRI
Keywords: open clusters and associations: individual: Pismis 11 -
stars : Hertzsprung-Russell (HR) and C-M diagrams - stars: early-type
Abstract:
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.
Description:
Coordinates and photometry for stars in the open cluster Pismis 11 and
the new open cluster Alicante 5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 64 145 Position in the map of stars with photometry
in the field of Pismis 11 (No. 1 to 147)
table3.dat 95 145 Photometry for stars in Pismis 11
table5.dat 95 105 Photometry for stars in Alicante 5
table6.dat 59 105 Position in the map of stars with photometry
in Alicante 5 (No. 1 to 105)
table8.dat 64 43 Photometry for membership in Pismis 11
table9.dat 61 22 Photometry for membership in Alicante 5
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Byte-by-byte Description of file: table[26].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/147] Number of the star in our nomenclature
5- 11 F7.2 pix Xpos ?=- X-Pixel position in the map
13- 19 F7.2 pix Ypos ?=- Y-Pixel position in the map
21- 22 I2 h RAh ? Right ascension (J2000.0)
24- 25 I2 min RAm ? Right ascension (J2000.0)
27- 32 F6.3 s RAs ? Right ascension (J2000.0)
34 A1 --- DE- Declination sign (J2000.0)
35- 36 I2 deg DEd ? Declination (J2000.0)
38- 39 I2 arcmin DEm ? Declination (J2000.0)
41- 45 F5.2 arcsec DEs ? Declination (J2000.0)
47- 58 A12 --- USNOB1 ?=- USNOB-1 identification
60- 64 A5 --- Note [2MASS ] For stars that have not
identification in USNOB-1, we use
2MASS identification
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Byte-by-byte Description of file: table[35].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/147] Number of the star in our nomenclature
5- 10 F6.3 mag Vmag ?=- Magnitude in V band
12- 16 F5.3 mag e_Vmag ?=- Deviation Standard in V
18 I1 --- o_Vmag ?=- Number of measurements in V
20- 25 F6.3 mag V-R ?=- Color index (V-R)
27- 31 F5.3 mag e_V-R ?=- Deviation Standard in (V-R)
33 I1 --- o_V-R ?=- Number of measurements in (V-R)
35- 41 F7.4 mag V-I ?=- Color index (V-I)
43- 47 F5.3 mag e_V-I ?=- Deviation Standard in (V-I)
49 I1 --- o_V-I ?=- Number of measurements in (V-I)
51- 56 F6.3 mag U-B ?=- Color index (U-B)
58- 62 F5.3 mag e_U-B ?=- Deviation Standard in (U-B)
64 I1 --- o_U-B ?=- Number of measurements in (U-B)
66- 71 F6.3 mag Bmag ?=- Magnitude in B
73- 77 F5.3 mag e_Bmag ?=- Deviation standard in B
79 I1 --- o_Bmag ?=- Number of measurements in B
81- 85 F5.3 mag B-V ? Color index (B-V)
87- 91 F5.3 mag e_B-V ? Deviation Standard in (B-V)
93 I1 --- o_B-V ? Number of measurements in (B-V)
95 A1 --- Flag [*] * indicates "Photometry for membership" in
tables 8 and 9 (for tables 3 and 5 resp.)
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Byte-by-byte Description of file: table[89].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/147] Number of the star in our nomenclature
5- 10 F6.3 mag V0mag Deredening magnitude in V band
12- 16 F5.3 mag e_V0mag Deviation Standard in V0
18- 22 F5.3 mag E(B-V) Color excess in (B-V)
24- 28 F5.3 mag e_E(B-V) Deviation Standard in E(B-V)
30- 34 F5.3 mag AV ?=- Absorption in V band
36- 40 F5.3 mag e_AV ?=- Deviation standard in AV
42- 47 F6.3 mag (B-V)0 Intrinsic color in (B-V)
49- 53 F5.3 mag e_(B-V)0 Deviation Standard in (B-V)0
55- 64 A10 --- SpType Spectral type obtained by photometry
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Acknowledgements:
Amparo Marco Tobarra, tobarra(at)dfists.ua.es
(End) Patricia Vannier [CDS] 20-Oct-2008