J/MNRAS/446/274 A deep catalogue of classical Be stars (Raddi+, 2015)
A deep catalogue of classical Be stars in the direction of the Perseus Arm:
spectral types and interstellar reddenings.
Raddi R., Drew J.E., Steeghs D., Wright N.J., Drake J.J., Barentsen G.,
Fabregat J., Sale S.E.
<Mon. Not. R. Astron. Soc. 446, 274 (2015)>
=2015MNRAS.446..274R 2015MNRAS.446..274R
ADC_Keywords: Stars, Be ; Photometry, H-alpha ; Photometry, infrared ;
Spectral types ; Reddening
Keywords: stars: early-type - stars: emission-line, Be - dust, extinction -
ISM: structure
Abstract:
We present a catalogue of 247 photometrically and spectroscopically
confirmed fainter classical Be stars (13<r<16) in the direction of the
Perseus Arm of the Milky Way (1°<b<+4°, 120°<l<140°).
The catalogue consists of 181 IPHAS-selected new classical Be stars,
in addition to 66 objects that we studied in our previous work more
closely, and three stars identified as classical Be stars in earlier
work. This study more than doubles the number known in the region.
Photometry spanning 0.6-5um, spectral types, and interstellar
reddenings are given for each object. The spectral types were
determined from low-resolution spectra
(λ/Δ_λ∼800-2000), to a precision of 1-3 subtypes.
The interstellar reddenings are derived from the (r-i) colour, using a
method that corrects for circumstellar disc emission. The colour
excesses obtained range from E(B-V)=0.3 up to 1.6 a distribution that
modestly extends the range reported in the literature for Perseus-Arm
open clusters. For around half the sample, the reddenings obtained are
compatible with measures of the total sightline Galactic extinction.
Many of these are likely to lie well beyond the Perseus Arm.
Description:
The classical Be stars in the catalogue are found in the strip of the
Galactic plane, contained within 120°≤l≤140° and
-1°≤b≤+4°. Their spatial distribution is shown in Fig. 1,
overplotted on the Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S) extinction
map of the area. As we reported in Paper I (Raddi et al.,
2013MNRAS.430.2169R 2013MNRAS.430.2169R), the follow-up spectroscopy targeted Hα
emitters, identified in IPHAS mainly by Witham et al.
(2008MNRAS.384.1277W 2008MNRAS.384.1277W, Cat. J/MNRAS/384/1277).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phot.dat 133 248 Positions and photometric data
(table A1 of the paper)
para.dat 108 247 Spectral types and interstellar reddenings
(table B1 of the paper)
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See also:
II/321 : IPHAS DR2 Source Catalogue (Barentsen+, 2014)
Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [1/248] Object's sequential number
5- 23 A19 --- IPHAS IPHAS designation (JHHMMSS.ss+DDMMSS.s) (1)
25- 30 F6.2 deg GLON Galactic longitude
32- 36 F5.2 deg GLAT Galactic latitude
38- 42 F5.2 mag rmag IPHAS r magnitude (2)
44- 47 F4.2 mag r-i IPHAS r-i colour index (2)
49- 52 F4.2 mag r-Ha IPHAS r-Ha (2)
54- 58 F5.2 mag Jmag 2MASS J magnitude
60- 63 F4.2 mag e_Jmag Error on Jmag
65- 68 F4.2 mag J-H 2MASS J-H colour index
70- 73 F4.2 mag e_J-H Error on J-H
75- 78 F4.2 mag H-K 2MASS H-K colour index
80- 83 F4.2 mag e_H-K Error on H-K
85- 89 F5.2 mag W1mag ? WISE W1 magnitude
91- 94 F4.2 mag e_W1mag ? Error on W1mag
96-100 F5.2 mag W1-W2 ? WISE W1-W2 colour index
102-105 F4.2 mag e_W1-W2 ? Error on W1-W2
108-111 F4.2 mag i-W1 ? i-W1 colour index
113-116 F4.2 mag e_i-W1 ? Error on i-W1
118-121 F4.2 mag J-W1 ? J-W1 colour index
123-126 F4.2 mag e_J-W1 ? Error on J-W1
128 A1 --- S1 [Y/N] has La Palma spectrum (3)
130 A1 --- S2 [Y/N] has FLWO-1.5m/FAST spectrum (3)
132-133 A2 --- f_ID [* ] Photometry notes (4)
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Note (1): Sexagesimal, equatorial position-based source name in the form:
JHHMMSS.ss+DDMMSS.s. The full naming convention for IPHAS sources has the form
"IPHAS JHHMMSS.ss+DDMMSS.s", where "J" indicates the position is J2000.
The "IPHAS" prefix is not listed explicitly in the designation column.
Note (2): Typical uncertainties in IPHAS magnitudes and colours are 0.02 and
0.03mag, respectively.
Note (3): Spectra are available for download at http://www.iphas.org/
Note (4): Notes as follows:
* = IPHAS photometry for these classical Be stars is not included in DR2,
because the corresponding fields were D-graded in Barentsen et al.
(2014MNRAS.444.3230B 2014MNRAS.444.3230B). Their photometry is to be considered accurate at
the level of ∼10 per cent.
** = This object is no more classified as a classical Be star but rather like
a Herbig Be star, and then is not in para.dat file
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Byte-by-byte Description of file: para.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [1/248] Object's sequential number
5- 11 A7 --- SpT1 Spectral type from La Palma spectra (5)
13- 14 I2 --- SN1 [21/81]? Signal-to-noise ratio measured
at 450nm (5)
16- 22 A7 --- SpT2 Spectral type from FLWO-1.5m/FAST (6)
24- 25 I2 --- SN2 [7/82]? Signal-to-noise ratio measured
at 450nm (6)
27- 30 F4.2 mag (r-i)c Corrected IPHAS (r-i) colour index (7)
32- 36 F5.2 mag (r-i)o Intrinsic (r-i) colour index (8)
38- 41 F4.2 mag E(r-i) E(r-i) colour excess
43- 46 F4.2 mag e_E(r-i) Error on E(r-i)
48- 50 I3 0.1nm W(Ha) [-99/-3] Photometric Hα equivalent width
in Angstrom (Å)
52- 55 F4.2 mag fD [0/0.33] Disc contribution to the SED at 550nm
57- 60 F4.2 mag E(r-i)cs E(r-i)cs: circumstellar colour excess
62- 65 F4.2 mag E(r-i)is E(r-i)is: interstellar colour excess
67- 70 F4.2 mag e_E(r-i)is Error on E(r-i)is
72- 75 F4.2 mag E(B-V)is E(B-V)is: interstellar reddening
77- 80 F4.2 mag e_E(B-V)is Error on E(B-V)is
82- 85 F4.2 mag E(B-V)is1 ? E(B-V)is: LS interstellar reddening (9)
87- 90 F4.2 mag e_E(B-V)is1 ? Error on E(B-V)is1
92- 95 F4.2 mag E(B-V)1 SFD98 sightline asymptotic reddening (10)
97-101 F5.2 mag E(B-V)2 RF09 sightline asymptotic reddening (11)
103-106 F4.2 mag E(B-V)3 S14 sightline asymptotic reddening (12)
108 A1 --- f_ID [*] Note on photometry (13)
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Note (5): Spectral types and signal-to-noise ratio determined from la Palma
spectra (Raddi et al., 2013MNRAS.430.2169R 2013MNRAS.430.2169R)
Note (6): Spectral types and signal-to-noise ratio determined from
FLWO-1.5m/FAST spectra.
Note (7): (r-i) colour index corrected for Hα emission.
Note (8): Intrinsic (r-i) colours adopted from Table 4 in Raddi et al.
(2013MNRAS.430.2169R 2013MNRAS.430.2169R).
Note (9): E(B-V) measured via least-squares fitting method (Raddi et al.,
2013MNRAS.430.2169R 2013MNRAS.430.2169R).
Note (10): Asymptotic interstellar reddening from Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S) multiplied by 0.86, as suggested by Schlafly et al.
(2010ApJ...725.1175S 2010ApJ...725.1175S).
Note (11): Asymptotic interstellar reddening from Rowles & Froebrich
(2009MNRAS.395.1640R 2009MNRAS.395.1640R).
Note (12): Asymptotic reddening measured via the 3D extinction maps by Sale
et al. (2014MNRAS.443.2907S 2014MNRAS.443.2907S).
Note (13): * = These objects carry a larger photometric uncertainty, because
their photometry does not meet the quality controls of DR2 (cf. file phot.dat
and Barentsen et al., 2014MNRAS.444.3230B 2014MNRAS.444.3230B).
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Acknowledgements:
Roberto Raddi, r.raddi(at) warwick.ac.uk (University of Warwick)
(End) Patricia Vannier [CDS] 20-Nov-2014