J/A+A/496/441 Radial velocities of Berkeley 32 stars (Randich+, 2009)
Membership and lithium in the old, metal-poor open cluster Berkeley 32.
Randich S., Pace G., Pastori L., Bragaglia A.
<Astron. Astrophys., 496, 441-451 (2009)>
=2009A&A...496..441R 2009A&A...496..441R
ADC_Keywords: Clusters, open ; Photometry ; Radial velocities
Keywords: stars: abundances - stars: evolution - stars: interiors -
open clusters and associations: individual: Berkeley 32
Abstract:
Measurements of lithium (Li) abundances in open clusters provide a
unique tool for following the evolution of this element with age,
metallicity, and stellar mass. In spite of the plethora of Li data
already available, the behavior of Li in solar-type stars has so far
been poorly understood.
Using FLAMES/Giraffe on the VLT, we obtained spectra of 157 candidate
members of the old, metal-poor cluster Berkeley 32, to determine
membership and to study the Li behavior of confirmed members.
Radial velocities were measured, allowing us to derive both the
cluster velocity and membership information for the sample stars. The
Li abundances were obtained from the equivalent width of the Li I
670.8nm feature, using curves of growth.
Description:
Be 32 was observed with two different FLAMES configurations (A and B)
centered at RA(2000)=06:58:04.2 and Dec(2000)=-06:28:21.1 and
RA(2000)=06:58:02.0 and Dec(2000)=-06:22:41.4, respectively. We
obtained four and one 3600s long exposures for configurations A and
B, respectively. Observations were obtained in Visitor mode on Jan.
20, 2005 (configuration A) and Jan. 21, 2005 (configuration B).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 157 Sample stars
table3.dat 37 57 Final results of our analysis
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See also:
J/A+A/480/79 : Abundances of giants in five Galactic clusters (Bragaglia+ 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 17 F6.3 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 30 F5.2 arcsec DEs Declination (J2000)
32- 34 A3 --- Conf [A,B ] Configuration of the FLAMES instrument
36- 41 F6.3 mag Bmag ?=- D'Orazi et al. (2006MNRAS.368..471D 2006MNRAS.368..471D)
B magnitude
43- 48 F6.3 mag V(B-V) ?=- D'Orazi et al. (2006MNRAS.368..471D 2006MNRAS.368..471D)
V magnitude from (B-V) colour index
50- 55 F6.3 mag V(V-I) ?=- D'Orazi et al. (2006MNRAS.368..471D 2006MNRAS.368..471D)
V magnitude from (V-I) colour index
57- 62 F6.3 mag Imag ?=- D'Orazi et al. (2006MNRAS.368..471D 2006MNRAS.368..471D)
I magnitude
64- 69 F6.3 mag Vmag Litterature V magnitude (1)
71- 75 F5.3 mag B-V ?=- Kaluzny & Mazur (1991AcA....41..167K 1991AcA....41..167K)
B-V colour index
77- 81 F5.3 mag V-I Richtler & Sagar (2001BASI...29...53R 2001BASI...29...53R)
V-I colour index
83- 87 F5.1 km/s RV ?=- Radial velocity
89- 92 F4.2 km/s e_RV ? rms uncertainty on RV
94 A1 --- Mm [mn?] Membership flag
96- 99 A4 --- Note Note
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Note (1): V magnitude from Kaluzny & Mazur (1991AcA....41..167K 1991AcA....41..167K) if the
star is present in their catalog otherwise from Richtler & Sagar
(2001BASI...29...53R 2001BASI...29...53R).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number
6- 10 F5.3 mag (B-V)0 Dereddened B-V colour index
11- 13 A3 --- n_(B-V)0 [ab*, ] Note on the origin of (B-V)0 (1)
15- 18 I4 K Teff Effective temperature
20- 21 A2 --- l_EW [≤ ] Limit flag on EW
22- 23 I2 0.1pm EW Li equivalent width
25- 26 I2 0.1pm e_EW ? rms uncertainty on EW
27- 28 A2 --- l_logN [≤ ] Limit flag on logn
29- 32 F4.2 [-] logN Li abundance (log(H)=12)
34- 37 F4.2 [-] e_logN ? rms uncertainty on logn
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Note (1): Notes as follows:
a = B-V from Richtler & Sagar (2001BASI...29...53R 2001BASI...29...53R)
b = (B-V)0 derived from (V-I) (see text)
* = B-V from D'Orazi et al. (2006MNRAS.368..471D 2006MNRAS.368..471D) available,
but not used (see text)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Apr-2009