J/A+A/462/123 VLT/Flames spectroscopic data of NGC 6530 (Prisinzano+, 2007)
VLT/Flames observations of the star forming region NGC 6530.
Prisinzano L., Damiani F., Micela G., Pillitteri I.
<Astron. Astrophys. 462, 123 (2007)>
=2007A&A...462..123P 2007A&A...462..123P
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Spectroscopy ;
Radial velocities ; Rotational velocities
Keywords: stars: pre-main sequence - stars: rotation -
accretion, accretion disks
Abstract:
Mechanisms regulating the evolution of pre-main sequence stars can be
understood by studying stellar properties such as rotation, disk
accretion, internal mixing and binarity. To investigate such
properties, we studied a sample of 332 candidate members of the
massive and populous star forming region NGC 6530.
We want to select cluster members by using different membership
criteria, to study the properties of pre-main sequence stars with or
without circumstellar disks.
We use intermediate resolution spectra including the LiI6707.8Å
line to derive radial and rotational velocities, binarity and to
measure the Equivalent Width of the lithium line; these results are
combined with X-ray data to study the cluster membership. Optical-IR
data and Hα spectra, these latter available for a subsample of
our targets, are used to classify CTTS and WTTS and to compare the
properties of stars with and without disks.
We find a total of 237 certain members including 53 binaries. The
rotational velocity distributions of stars with IR excesses are
statistically different from that of stars without IR excesses, while
the fraction of binaries with disks is significantly smaller than that
of single stars. Stars with evidence for accretion show circumstellar
disks; youth of cluster members is confirmed by the lithium abundance
consistent with the initial content.
As indicated by the disk-locking picture, stars with disks have in
general rotational velocities lower than stars without disks. Binaries
in NGC 6530 seem have undergone a significant disk evolution.
Description:
New spectroscopic results and literature optical and IR photometry of
a sample of candidate members of the Star Forming Region NGC 6530 are
presented. The selected targets were observed with the GIRAFFE-FLAMES
multi-object fiber spectrograph of the ESO-VLT Kueyon Telescope.
Results from spectra obtained using the MEDUSA fibre system with the
setup HR15, which gives a resolution R=19300 in the wavelength range
[6606,6905]Å, and with the setup HR14, which gives a resolution
R=28800 in the wavelength range [6383,6626]Å, are given.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 130 332 Target positions and optical-IR magnitudes
table3.dat 85 332 Spectroscopic results
--------------------------------------------------------------------------------
See also:
J/A+A/430/941 : Star formation region NGC 6530 (Prisinzano+, 2005)
J/ApJ/608/781 : NGC 6530 Chandra X-ray catalog (Damiani+, 2004)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 11 F5.2 s RAs Right ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
17- 18 I2 arcmin DEm Declination (J2000.0)
20- 24 F5.2 arcsec DEs Declination (J2000.0)
26- 29 I4 --- Sp Spectrum number
31- 33 I3 --- IDX ?=- Designation from Damiani et al.
(2006A&A...459..477D 2006A&A...459..477D)
35- 39 I5 --- WFI Designation from Prisinzano et al. (2005,
Cat. J/A+A/430/941,
Cl* NGC 6530 WFI NNNNN in Simbad)
41- 46 F6.3 mag Bmag Landolt B magnitude from J/A+A/430/941
48- 52 F5.3 mag e_Bmag rms uncertainty on the Landolt B magnitude
54- 59 F6.3 mag Vmag Landolt V magnitude from J/A+A/430/941
61- 65 F5.3 mag e_Vmag rms uncertainty on the Landolt V magnitude
67- 72 F6.3 mag Imag Cousins I magnitude from J/A+A/430/941
74- 78 F5.3 mag e_Imag rms uncertainty on the Cousins I magnitude
80- 85 F6.3 mag Jmag ?=- J magnitude from 2MASS II/246
87- 91 F5.3 mag e_Jmag ?=- rms uncertainty on the J magnitude
93- 98 F6.3 mag Hmag ?=- H magnitude from 2MASS II/246
100-104 F5.3 mag e_Hmag ?=- rms uncertainty on the H magnitude
106-111 F6.3 mag Kmag ?=- K magnitude from 2MASS II/246
113-117 F5.3 mag e_Kmag ?=- rms uncertainty on the K magnitude
119-123 F5.2 Myr Age Estimated age from J/A+A/430/941
125-130 F6.2 solMass Mass ?=-99.99 Estimated mass from J/A+A/430/941
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Sp Spectrum number
6 A1 --- SB2 [Y] Binarity flag
8- 14 F7.2 km/s RV ?=- Radial velocity
16- 20 F5.2 km/s e_RV ?=- rms uncertainty on RV
22- 27 F6.2 km/s vsini ?=- Rotational velocity
29- 33 F5.2 km/s e_vsini ?=- rms uncertainty on vsini
35- 38 I4 K Teff Effective Temperature from V-I color index
(from J/A+A/430/941)
40- 44 F5.1 0.1nm EW(Li) ?=- Equivalent width of the lithium line
46- 50 F5.1 0.1nm EW2(Li) ?=- Equivalent width of the lithium line of
the second component
52- 55 F4.1 0.1nm FWZI(Ha) ?=- Full Width Zero Intensity of Hα line
57 A1 --- MembX [YN] Membership flag based on X-ray detection
59 A1 --- MembRV [YN] Membership flag based on radial velocity
61 A1 --- MembLi [YN] Membership flag based on lithium
equivalent width
63- 64 A2 --- QJHHK [Y-N] IR excess flag based on the QJHHK index
66- 67 A2 --- QVIJK [Y-N] IR excess flag based on the QVIJK index
69- 70 A2 --- QVIIJ [Y-N] IR excess flag based on the QVIIJ index
72- 73 A2 --- QBVJK [Y-N] IR excess flag based on the QBVJK index
75- 76 A2 --- Class [CW ?-] CTT or WTT classification based on the
Hα line (1)
78- 82 A5 --- PT Profile type of the Hα line (2)
84- 85 A2 --- Memb [M NM?] Membership (M=member, NM=non member)
--------------------------------------------------------------------------------
Note (1): Classification as follows:
C = CTTS (Classical T Tau star)
C? = possible CTTS
W = WTT (Weak-lined T Tauri stars)
Note (2): Profile type of the Hα line as follows:
AE = broad absorption Hα line, with the core filled of the
narrow nebular emission Hα
EG = quite symmetric and "narrow" line profile, likely originated
only from the nebular emission
YY = YY Ori profile (inverse P Cygni profile)
CE? = slight broad wings which can be due to "normal" chromospheric
emission or to low accretion
PCI = Type I P Cygny profile
PCIII = Type III P Cygny profile
--------------------------------------------------------------------------------
History:
* 31-Oct-2006: Original version
* 15-May-2007: IDX label reference corrected
Acknowledgements:
Loredana Prisinzano, loredana(at)astropa.unipa.it
(End) Patricia Vannier [CDS] 31-Oct-2006