J/MNRAS/421/3622 Candidate Be stars in the Magellanic Clouds (Paul+, 2012)
Study of candidate Be stars in the Magellanic Clouds using near-infrared
photometry and optical spectroscopy.
Paul K.T., Subramaniam A., Mathew B., Mennickent R.E., Sabogal B.
<Mon. Not. R. Astron. Soc., 421, 3622-3640 (2012)>
=2012MNRAS.421.3622P 2012MNRAS.421.3622P
ADC_Keywords: Magellanic Clouds ; Stars, Be ; Equivalent widths
Keywords: techniques: spectroscopic - circumstellar matter -
stars: emission-line, Be - Magellanic Clouds
Abstract:
Mennickent et al. (2002A&A...393..887M 2002A&A...393..887M) and Sabogal et al. (2005, Cat.
J/MNRAS/361/1055) identified a large number of classical Be (CBe)
candidates (∼3500) in the Large and Small Magellanic Clouds (LMC and
SMC) based on their photometric variability using the OGLE II data
base (Udalski et al., 1998, Cat. J/AcA/48/147; 2000, Cat.
J/AcA/50/307). They classified these stars into four different groups
based on the appearance of their variability. In order to refine and
understand the nature of this large number of stars, we studied the
infrared properties of the sample and the spectroscopic properties of
a subsample. We cross-correlated the optical sample with the IRSF-MCPS
catalogue to obtain the J, H, Ks magnitudes of all the four types of
stars (∼2500) in the LMC and SMC. Spectra of 120 stars belonging to
the types 1, 2 and 3 were analysed to study their spectral properties.
Description:
Catalogues of Be star candidates in the SMC and the LMC as identified
by Mennickent et al. (2002A&A...393..887M 2002A&A...393..887M) (∼1000 stars) and Sabogal
et al. (2005, Cat. J/MNRAS/361/1055) (2446 stars), respectively, were
used. In order to obtain their NIR properties, we used the NIR IRSF
catalogue (Kato et al. 2007, Cat. II/288) which has JHKs photometric
data for about 15 million point sources spread over a 40deg2 area of
the LMC and 2.7 million sources spread over a 11deg2 area of the SMC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 102 20 Type 3 stars in the SMC present in our sample
table3.dat 82 12 Type 3 stars in the LMC present in our sample
table4.dat 82 16 Type 2 stars in the SMC present in our sample
table5.dat 72 9 Type 2 stars in the LMC present in our sample
table6.dat 82 27 Type 1 stars in the SMC present in our sample
table7.dat 82 18 Type 1 stars in the LMC present in our sample
table8.dat 74 49 *List of spectral lines observed in the sample of
Be candidate stars in the SMC
table9.dat 72 23 *List of spectral lines observed in the sample of
Be candidate stars in the LMC
table10.dat 72 47 List of spectral lines observed in the sample of
Be candidate stars (spectra obtained from the
2.5-m Las Campanas Observatory)
tablea1.dat 84 72 Log of spectroscopic observations from
the 1.5m CTIO telescope
tablea2.dat 64 48 Log of spectroscopic observations from
the 2.5-m Las Campanas Observatory telescope
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Note on table8.dat and table9.dat: type 1, 2 and 3 as defined by Mennickent et
al. (2006A&A...457..949M 2006A&A...457..949M).
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See also:
II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007)
J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+ 1998)
J/AcA/50/307 : OGLE LMC BVI photometry (Udalski+, 2000)
J/MNRAS/361/1055 : BVI photometry of LMC Be stars (Sabogal+, 2005)
Byte-by-byte Description of file: table[234567].dat
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Bytes Format Units Label Explanations
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1- 3 F3.1 m Inst Instrument (G1)
5- 12 A8 --- Star Star name
14- 17 A4 --- --- [OGLE]
18- 35 A18 --- OGLE OGLE name (HHMMSS.ss+DDMMSS.s)
37- 41 F5.2 mag (B-V)0 ?=- Dereddened B-V colour index
43- 47 F5.2 mag V0mag ?=- Dereddened V magnitude
49- 53 F5.2 mag (H-K)0 ?=- Dereddened H-K colour index
55- 59 F5.2 mag (J-H)0 ?=- Dereddened J-H colour index
61- 65 A5 --- SpT MK spectral type (this study)
68- 72 F5.2 mag E(B-V) ?=- Redenning
74- 76 I3 km/s RV ? Velocity (this study)
78- 79 I2 km/s e_RV ? rms uncertainty on RV
81- 82 I2 --- o_RV ? Number of lines averaged for RV determination
84- 92 A9 --- SpT.M MK spectral class from Mennickent et al.
(2006A&A...457..949M 2006A&A...457..949M) (only for table2) (1)
94- 96 I3 km/s RV.M ? Radial Velocity from Mennickent et al.
(2006A&A...457..949M 2006A&A...457..949M) (only for table2)
98- 99 I2 km/s e_RV.M ? rms uncertainty on RV.M (only for table2)
101-102 I2 --- o_RV.M ? Number of lines averaged for RV.M
determination (only for table2)
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Note (1): Spectral type determined by Mennickent & Smith (2010MNRAS.407..734M 2010MNRAS.407..734M)
for the star smc3-1 and Mennickent et al. (2006A&A...457..949M 2006A&A...457..949M) for the rest
of the stars.
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Byte-by-byte Description of file: table8.dat table9.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 14 F5.2 0.1nm W(Ca)II ?=- CaII equivalent width
16- 20 F5.2 0.1nm W(Heps) ?=- Hε equivalent width
22- 26 F5.2 0.1nm W(HeI)1 ?=- HeI equivalent width
28- 33 F6.3 0.1nm W(Hd) ?=- Hδ equivalent width
34- 35 A2 --- n_W(Hd) [ea] Line with emission/absorption (1)
36- 40 F5.2 0.1nm W(Hg) ?=- Hγ equivalent width
42- 45 F4.2 0.1nm W(HeI)2 ?=- HeI equivalent width
47- 51 F5.2 0.1nm W(HeI)3 ?=- HeI equivalent width
52- 53 A2 --- n_W(HeI)3 [ea] Line with emission/absorption (1)
55- 60 F6.3 0.1nm W(Hb) ?=- Hβ equivalent width
61- 62 A2 --- n_W(Hb) [ea] Line with emission/absorption (1)
63- 68 F6.2 0.1nm W(Ha) ? Hα equivalent width
69- 70 A2 --- n_W(Ha) [ea] Line with emission/absorption (1)
71- 72 A2 --- Com [# ] Missing spectra (2)
74 I1 --- Nsp ? Number of spectra in the red region
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Note (1): Flag as follows:
ea = emission in absorption line in Hα
ae = absorption in emission line in Hα
Note (2): Comments as follows:
# = no spectra available for these stars in the red region
## = no spectra available for these stars in the blue region
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 13 F4.2 0.1nm W(Hd) ?=- Hδ 4101 equivalent width
15- 19 F5.2 0.1nm W(Hg) ?=- Hγ 4340 equivalent width
21- 25 F5.2 0.1nm W(HeI)1 ?=- HeI 4387 equivalent width
27- 30 F4.2 0.1nm W(HeI)2 ?=- HeI 4471 equivalent width
32- 36 F5.2 0.1nm W(FeII)1 ?=- FeII 4629 equivalent width
38- 42 F5.2 0.1nm W(HeI)3 ?=- HeI 4713 equivalent width
44- 48 F5.2 0.1nm W(Hb) ?=- Hβ 4861 equivalent width
50- 54 F5.2 0.1nm W(HeI)4 ?=- HeI 4922 equivalent width
56- 60 F5.2 0.1nm W(HeI)5 ?=- HeI 5015 equivalent width
62- 66 F5.2 0.1nm W(SiII) ?=- SiII 5052 equivalent width
68- 72 F5.2 0.1nm W(FeII)2 ?=- FeII 5169 equivalent width
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 13 A4 --- --- [OGLE]
14- 31 A18 --- OGLE OGLE ID (HHMMSS.ss+DDMMSS.s)
33- 42 A10 "DD-MM-YYYY" ObsBlue Blue spectra date of OBS
44- 46 I3 s ExpTB ? Exposure time for blue spectra
48- 57 A10 "DD-MM-YYYY" ObsRed Red spectra date of OBS
59- 61 I3 s ExpTR ? Exposure time for red spectra
63-102 A40 --- Com Comment on Halpha profile
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 13 A4 --- --- [OGLE]
14- 31 A18 --- OGLE OGLE ID (HHMMSS.ss+DDMMSS.s)
33- 42 A10 "DD-MM-YYYY" Obs Date of observation
44- 46 I3 s ExpT Exposure time
48 I1 --- Nexp Number of exposures
50- 89 A40 --- Com Comment on Hbeta profile
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Global notes:
Note (G1): Instrument size refer to:
1.5 = Spectra from 1.5-m Cerro Tololo Inter-American Observatory (CTIO)
2.5 = Spectra from 2.5-m Las Campanas Observatory (LCO)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Mar-2013