J/AJ/134/825 BVI photometry in M55 (NGC 6809) (Vargas+, 2007)
Evolved stars in the galactic globular cluster M 55 (NGC 6809).
Vargas Alvarez C.A., Sandquist E.L.
<Astron. J., 134, 825-834 (2007)>
=2007AJ....134..825V 2007AJ....134..825V
ADC_Keywords: Clusters, globular ; Photometry, UBVRI
Keywords: globular clusters: individual (M55) - stars: abundances -
stars: evolution - stars: horizontal-branch
Abstract:
We have compiled the asymptotic giant, horizontal, and upper red giant
branch (AGB, HB, and RGB) stars in the globular cluster M55 (NGC
6809). Using the star counts and the R-parameter we compute the
initial helium abundance Y=0.274±0.016.
Description:
The data were taken from several literature sources:
Lee (1977A&AS...29....1L 1977A&AS...29....1L, L77),
Mandushev et al. (1997AJ....114.1060M 1997AJ....114.1060M, M97),
Olech et al. (1999AJ....118..442O 1999AJ....118..442O, O99),
Pych et al. (2001A&A...367..148P 2001A&A...367..148P, P01), and
Richter et al. (1999A&A...350..476R 1999A&A...350..476R, R99).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 19 666 Stars list
table2.dat 67 1988 The interior stars in M 55
--------------------------------------------------------------------------------
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- ID Identification number from this study (1)
5- 11 F7.2 arcsec oRA Right Ascension offset from cluster center (2)
13- 19 F7.2 arcsec oDE Declination offset from cluster center (2)
--------------------------------------------------------------------------------
Note (1): Stars classification is related to star ID:
V1 to V13 = RR Lyr
1 to 268 = HB (horizontal branch) star
269 to 312 = AGB (asymptotic giant branch)
313 to 653 = RGB (red giant branch)
Stars are identified in Simbad as
Cl* NGC 6809 VS VNN and Cl* NGC 6809 VS NNN
Note (2): The positions we tabulate are given in arcseconds from the center
of the cluster (taken to be 19:39:49.40-30:47:43.5 (J2000.0)), with
the x position being the RA offset and the y position being the DE
offset (positive being higher RA and DE).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- ID Identification number from this study (1)
5- 9 A5 --- ID2 Identification number from the original study
11- 16 F6.3 mag Bmag The B band magnitude (3)
18- 22 F5.3 mag e_Bmag ? Error in Bmag
24- 29 F6.3 mag Vmag The V band magnitude (3)
31- 35 F5.3 mag e_Vmag ? Error in Vmag
37- 42 F6.3 mag Imag ? The I band magnitude
44- 48 F5.3 mag e_Imag ? Error in Imag
50- 52 A3 --- Cat Catalog photometry (4)
54- 67 A14 --- Spc Star observed in other studies (5)
--------------------------------------------------------------------------------
Note (1): The first row is the compilated photometry in scaled to the M97
photometry. The following rows with the same ID is the same star with
the photometry detected in the original study.
Note (3): The Stromgren photometry from Richter et al.(1999A&A...350..476R 1999A&A...350..476R)
was reported in the columns for the B and V band magnitudes. The
Stromgren b band is listed under the B band, and the Stromgren y band
is listed under the V band column.
Note (4): Catalogues as follows:
VS = Vargas Alvarez & Sandquist, this paper
L77 = Lee (1977A&AS...29....1L 1977A&AS...29....1L)
M97 = Mandushev et al. (1997AJ....114.1060M 1997AJ....114.1060M)
O99 = Olech et al. (1999AJ....118..442O 1999AJ....118..442O)
P01 = Pych et al. (2001A&A...367..148P 2001A&A...367..148P)
R99 = Richter et al. (1999A&A...350..476R 1999A&A...350..476R)
Note (5): References as follows:
B90 = Briley et al. (1990ApJ...359..307B 1990ApJ...359..307B)
B93 = Briley et al. (1993AJ....106..142B 1993AJ....106..142B)
SN82 = Smith & Norris (1982ApJ...254..149S 1982ApJ...254..149S)
W81 = Webbink (1981ApJS...45..259W 1981ApJS...45..259W)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 30-Sep-2009