J/other/NewA/56.28 Be stars in MC star clusters NIR properties (Paul+, 2017)
NIR properties of Be stars in star clusters in the Magellanic Clouds.
Paul K.T., Annapurni S., Blesson M., Shruthi S.B.
<New Astron., 56, 28-49 (2017)>
=2017NewA...56...28P 2017NewA...56...28P (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, Be ; Photometry, infrared ;
Photometry, UBVRI ; Photometry, H-alpha
Keywords: stars - emission-line - Be: infrared - stars: galaxies -
Magellanic Clouds
Abstract:
Magellanic Clouds are the nearby galaxies which are ideal to study the
properties of metal poor stellar population. In this study, we explore
the near-IR properties of optically identified classical Be stars in
19 star clusters in the Magellanic Clouds. From an optically
identified sample of 835 Be stars we obtained the J, H, K magnitudes
of 389 stars from the IRSF MCPS catalog. Among these, 247 stars
(36.4%) are found in 9 clusters in the Large Magellanic Cloud and 142
stars (55.5%) in 10 clusters in the Small Magellanic Cloud. After
correcting for reddening, we studied their NIR properties in the
(H-K)0 vs (J-H)0 diagram. We identified 14 stars with
abnormally large near IR excesses, which were removed from the
analysis, there by restricting our study to 355 classical Be stars. We
propose an extended area in the near-IR (H-K)0 vs (J-H)0 diagram
as the diagnostic location of Classical Be stars in the Magellanic
Clouds. We identified 14 stars to have near-IR excess, higher than
those seen in classical Be stars. From the analysis based on spectral
energy distribution and luminosity estimate, we found that 8 candidate
Be stars may be Herbig Ae/Be stars. We identified a new sample of 6
sgB[e] stars, which when added to the sparse existing sample of 15
sgB[e] stars in the Magellanic Clouds can provide insight to
understand the evolutionary link between sgB[e] stars and Luminous
Blue variables.
Description:
In order to obtain the NIR properties of Be candidates in the LMC and
the SMC, we used the NIR IRSF-MCPSC catalog (Kato et al.,
2007PASJ...59..615K 2007PASJ...59..615K, Cat. II/288).
The optically identified candidate Be stars in each cluster were
cross-matched with the IRSF-MCPSC catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 104 235 Optical and NIR photometric magnitudes of Be
candidate stars identified in the LMC and SMC
clusters
table6.dat 93 153 Optical and NIR photometric magnitudes of Be
candidate stars identified in the LMC and SMC
clusters
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See also:
II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007)
J/A+AS/134/489 : Be stars in MC young clusters (Keller+ 1999)
J/ApJ/652/458 : Candidates Be stars BVRHα photometry (Wisniewski+, 2006)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Cluster Cluster name (1)
11- 13 I3 --- Star Star number within the cluster,
WBBe Cluster Star in Simbad (1)
15- 16 I2 h RAh Right ascension (J2000) (1)
18- 19 I2 min RAm Right ascension (J2000) (1)
21- 25 F5.2 s RAs Right ascension (J2000) (1)
27 A1 --- DE- Declination sign (J2000) (1)
28- 29 I2 deg DEd Declination (J2000) (1)
31- 32 I2 arcmin DEm Declination (J2000) (1)
34- 38 F5.2 arcsec DEs Declination (J2000) (1)
40- 44 F5.2 mag Vmag V magnitude (1)
46- 49 F4.2 mag e_Vmag rms uncertainty on Vmag (1)
51- 55 F5.2 mag B-V B-V colour index (1)
57- 60 F4.2 mag e_B-V rms uncertainty on B-V (1)
62- 66 F5.2 mag R-Ha R-Hα colour index (1)
68- 71 F4.2 mag e_R-Ha rms uncertainty on R-Ha (1)
73- 77 F5.2 mag Jmag J magnitude (2)
79- 82 F4.2 mag e_Jmag rms uncertainty on Jmag
84- 88 F5.2 mag Hmag H magnitude (2)
90- 93 F4.2 mag e_Hmag rms uncertainty on Hmag (2)
95- 99 F5.2 mag Kmag K magnitude (2)
101-104 F4.2 mag e_Kmag rms uncertainty on Kmag
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Note (1): from Wisniewski & Bjorkman (2006, Cat. J/ApJ/652/458).
Note (2): J, H and K magnitudes are obtained by cross-matching with the
IRSF-MCPSC catalog (Kato et al., 2007, Cat. II/288).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Star name (Cluster KWBBe NNNN),
Cl* Cluster KWBBe NNNN in Simbad (1)
20- 21 I2 h RAh Right ascension (J2000) (1)
23- 24 I2 min RAm Right ascension (J2000) (1)
26- 30 F5.2 s RAs Right ascension (J2000) (1)
32 A1 --- DE- Declination sign (J2000) (1)
33- 34 I2 deg DEd Declination (J2000) (1)
36- 37 I2 arcmin DEm Declination (J2000) (1)
39- 43 F5.2 arcsec DEs Declination (J2000) (1)
45- 49 F5.2 mag Vmag V magnitude (1)
51- 55 F5.2 mag V-I V-I colour index (1)
57- 60 F4.2 mag R-Ha R-Hα colour index (1)
62- 66 F5.2 mag Jmag J magnitude (2)
68- 71 F4.2 mag e_Jmag rms uncertainty on Jmag
73- 77 F5.2 mag Hmag H magnitude (2)
79- 82 F4.2 mag e_Hmag rms uncertainty on Hmag (2)
84- 88 F5.2 mag Kmag K magnitude (2)
90- 93 F4.2 mag e_Kmag rms uncertainty on Kmag
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Note (1): from Keller et al. (1999, Cat. J/A+AS/134/489).
Note (2): J, H and K magnitudes are obtained by cross-matching with the
IRSF-MCPSC catalog (Kato et al., 2007, Cat. II/288).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Nov-2017