J/MNRAS/421/3325 2 new candidate luminous blue variables (Gvaramadze+ 2012)
Discovery of two new Galactic candidate luminous blue variables with
Wide-field Infrared Survey Explorer.
Gvaramadze V.V., Kniazev A.Y., Miroshnichenko A.S., Berdnikov L.N.,
Langer N., Stringfellow G.S., Todt H., Hamann W.-R., Grebel E.K.,
Buckley D., Crause L., Crawford S., Gulbis A., Hettlage C., Hooper E.,
Husser T.-O., Kotze P., Loaring N., Nordsieck K.H., O'Donoghue D.,
Pickering T., Potter S., Romero Colmenero E., Vaisanen P., Williams T.,
Wolf M., Reichart D.E., Ivarsen K.M., Haislip J.B., Nysewander M.C.,
Lacluyze A.P.
<Mon. Not. R. Astron. Soc., 421, 3325-3337 (2012)>
=2012MNRAS.421.3325G 2012MNRAS.421.3325G
ADC_Keywords: Stars, variable ; Stars, blue ; Stars, luminous ;
Equivalent widths ; Radial velocities
Keywords: line: identification - circumstellar matter -
stars: emission-line, Be - stars: evolution -
stars: individual: Hen 3-1383 - stars: massive
Abstract:
We report the discovery of two new Galactic candidate luminous blue
variable (LBV) stars via detection of circular shells (typical of
confirmed and candidate LBVs) and follow-up spectroscopy of their
central stars. The shells were detected at 22um in the archival data
of the Mid-Infrared All Sky Survey carried out with the Wide-field
Infrared Survey Explorer (WISE). Follow-up optical spectroscopy of the
central stars of the shells conducted with the renewed Southern
African Large Telescope (SALT) showed that their spectra are very
similar to those of the well-known LBVs P Cygni and AG Car, and the
recently discovered candidate LBV MN112, which implies the LBV
classification for these stars as well.
Description:
Two circular shells, which are the main subject of this paper, were
discovered using the WISE 22-um archival data.
Spectral observations of WS1 and WS2 were conducted with SALT on 2011
June 12 and 13 during the performance verification phase of the Robert
Stobie Spectrograph.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 113 2 Details of central stars associated with two
circular shells discovered with WISE
table1.dat 45 25 EWs, FWHMs and RVs of some detected lines in the
spectrum of WS1 (taken on 2011 June 12)
table2.dat 77 27 EWs, FWHMs and RVs of some detected lines in the
spectra of WS2 taken on 2011 June 13 and
2011 September 10
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Name [WS1 WS2] Name (WS2 = Hen 3-1383)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 36 F8.4 deg GLON Galactic longitude
38- 44 F7.4 deg GLAT Galactic latitude
46- 50 F5.2 mag Bmag B magnitude
52- 55 F4.2 mag e_Bmag rms uncertainty on Bmag
57- 61 F5.2 mag Vmag V magnitude
63- 66 F4.2 mag e_Vmag rms uncertainty on Vmag
68- 71 F4.2 mag [3.4] Spitzer/IRAC 3.4um magnitude
73- 76 F4.2 mag e_[3.4] rms uncertainty on [3.4]
78- 81 F4.2 mag [4.6] Spitzer/IRAC 4.6um magnitude
83- 86 F4.2 mag e_[4.6] rms uncertainty on [4.6]
88- 91 F4.2 mag [12] WISE W3 (12um) magnitude
93- 96 F4.2 mag e_[12] rms uncertainty on [12]
98-101 F4.2 mag [22] WISE W4 (22um) magnitude
103-106 F4.2 mag e_[22] rms uncertainty on [22]
108-113 A6 --- Table Table with EW, FWHM and RV
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 0.1nm lambda0 Wavelength
6- 13 A8 --- Ion Ion designation
15- 20 F6.2 0.1nm EW1 Equivalent width for observation 1 (1)
22- 25 F4.2 0.1nm e_EW1 rms uncertainty on EW1
27- 31 F5.2 0.1nm FWHM1 Full Width at Half Maximum
for observation 1 (1)
33- 36 F4.2 0.1nm e_FWHM1 rms uncertainty on FWHM1
38- 41 I4 km/s RV1 Radial velocity for observation 1 (1)
43- 44 I2 km/s e_RV1 rms uncertainty on RV1
45 A1 --- n_RV1 [*] * for line noticeably affected by
P Cygni absorptions
47- 52 F6.2 0.1nm EW2 ?=- Equivalent width for observation 2 (2)
54- 57 F4.2 0.1nm e_EW2 ? rms uncertainty on EW2
59- 63 F5.2 0.1nm FWHM2 ?=- Full Width at Half Maximum
for observation 2 (2)
65- 68 F4.2 0.1nm e_FWHM2 ? rms uncertainty on FWHM2
70- 73 I4 km/s RV2 ?=- Radial velocity for observation 2 (2)
75- 76 I2 km/s e_RV2 ? rms uncertainty on RV2
77 A1 --- n_RV2 [*] * for line noticeably affected by
P Cygni absorptions
--------------------------------------------------------------------------------
Note (1): Observations dates:
WS1 = 2011 June 12
WS2 = 2011 June 13
Note (2): Observations date:
WS2 = 2011 September 10
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Mar-2013