J/A+A/552/A92 uvby photometry in NGC 7419 (Marco+, 2013)
NGC 7419 as a template for red supergiant clusters.
Marco A., Negueruela I.
<Astron. Astrophys. 552, A92 (2013)>
=2013A&A...552A..92M 2013A&A...552A..92M
ADC_Keywords: Clusters, open ; Photometry, uvby
Keywords: open cluster and associations: individual: NGC 7419 -
Hertzsprung-Russell and C-M diagrams - stars: early-type -
stars: emission-line, Be - supergiant
Abstract:
The open cluster NGC 7419 is known to contain five red supergiants and
a very high number of Be stars. However, there are conflicting reports
about its age and distance that prevent a useful comparison with other
clusters.
We intend to obtain more accurate parameters for NGC 7419, using
techniques different from those of previous authors, so that it may be
used as a calibrator for more obscured clusters.
We obtained Stroemgren photometry of the open cluster NGC 7419, as
well as classification spectroscopy of ∼20 stars in the area. We
then applied standard analysis and classification techniques.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 73 199 Photometry and coordinates for stars in the
field of NGC 7419
table4.dat 51 126 *2MASS photometry for stars of NGC 7419
table7.dat 29 141 Photometry for membership of NGC 7419
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Note on table4.dat: taken from Skrutskie et al., 2006, Cat. VII/233 (2MASX).
In this table we show the 2MASS photometric values for the stars confirmed as
cluster members in Section: Observational HR diagram, that have good-quality
photometric flags and photometric errors below 0.05mag in all 2MASS filters.
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/MNRAS/391/1279 : Multiwavelength study of NGC 7419 (Joshi+, 2008)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [2/295] Star sequential number (this paper)
5- 8 I4 --- Webda Star number taken from the Webda database (1)
10- 11 I2 h RAh ? Right ascension (J2000) (2)
13- 14 I2 min RAm ? Right ascension (J2000) (2)
16- 20 F5.2 s RAs ? Right ascension (J2000) (2)
22 A1 --- DE- Declination sign (J2000) (2)
23- 24 I2 deg DEd ? Declination (J2000) (2)
26- 27 I2 arcmin DEm ? Declination (J2000) (2)
29- 33 F5.2 arcsec DEs ? Declination (J2000) (2)
35- 40 F6.3 mag Vmag V-band magnitude
42- 46 F5.3 mag e_Vmag rms uncertainty on Vmag (3)
48- 52 F5.3 mag b-y Stroemgren b-y colour index
54- 58 F5.3 mag e_b-y rms uncertainty on b-y (3)
60- 65 F6.3 mag c1 Stroemgren c1 index
67- 71 F5.3 mag e_c1 rms uncertainty on c1 (3)
73 I1 --- N Number of measurements for each magnitude,
colour or index
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Note (1): http://www.univie.ac.at/webda/
Note (2): taken from Joshi et al. (2008, Cat. J/MNRAS/391/1279).
Note (3): The error assigned is the standard deviation for stars with three or
four measurements and the photometric errors from DAOPHOT for stars with only
one measurement, with the errors in the colour indices calculated through
error propagation.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Type [B S Be] Star type (1)
4- 6 I3 --- Seq [2/295]? Star sequential number (this paper)
9- 14 F6.3 mag Jmag 2MASS J magnitude
16- 20 F5.3 mag e_Jmag rms uncertainty on Jmag
22- 27 F6.3 mag Hmag 2MASS H magnitude
29- 33 F5.3 mag e_Hmag rms uncertainty on Hmag
35- 40 F6.3 mag Kmag 2MASS Ks magnitude
42- 46 F5.3 mag e_Kmag rms uncertainty on Kmag
48- 51 A4 --- BMD Name of the 5 red supergiants, BNNN,
<Cl* NGC 7419 BMD NNN> in Simbad
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Note (1): Star types as follows:
B = B star
S = supergiants (B921=56, B950, B696=122, B435, B139)
Be = Be type stars
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [2/295] Star sequential number (this paper)
5- 9 F5.3 mag E(B-V) Individual reddenings for each member cluster (1)
11- 16 F6.3 mag VMAG Absolute magnitude in V for each member
18- 29 A12 --- SpType Estimated photometric spectral types for each
member (2)
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Note (1): calculated following the procedure described by Crawford et al.
(1970AJ.....75..822C 1970AJ.....75..822C).
Note (2): With the aid of these individual values of reddening, we calculated
the intrinsic colours c0 and magnitudes V0 of the normal B-type members.
From c0 and V0, we estimated photometric spectral types using the calibration
for c0 from Crawford (1978AJ.....83...48C 1978AJ.....83...48C). For those stars with spectroscopic
spectral types, the agreement between photometric and spectroscopic types is
excellent, certifying the correctness of the dereddening procedure.
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Acknowledgements:
Amparo Marco, tobarra(at)dfists.ua.es
(End) Patricia Vannier [CDS] 26-Feb-2013