J/ApJS/259/38 Ha emission-line stars & Herbig Ae/Be from LAMOST (Zhang+, 2022)
A catalog of early-type Hα emission-line stars and 62 newly confirmed
Herbig Ae/Be stars from LAMOST Data Release 7.
Zhang Y.-J., Hou W., Luo A.-L., Li S., Qin L., Lu Y., Li Y.-B., Chen J.-J.,
Zhao Y.-H.
<Astrophys. J. Suppl. Ser., 259, 38 (2022)>
=2022ApJS..259...38Z 2022ApJS..259...38Z
ADC_Keywords: Stars, emission; Stars, Be; Stars, variable; Radial velocities;
Stars, distances; Spectral types; Spectra, optical
Keywords: Ae stars ; Pre-main sequence ; Be stars ; Herbig Ae/Be stars
Abstract:
We derive a catalog of early-type emission-line stars including
30023 spectra of 25867 stars from LAMOST Data Release 7, in which
4189 have Simbad records. The spectra are classified into three
morphological types (10 subtypes) based on Hα emission-line
profiles. Some spectra contaminated by nebula emission lines such as
from HII regions are flagged in the catalog. We also provide a
specific catalog of 20 stars with stellar winds or accretion flows by
calculating the terminal and peak velocities based on P-Cygni or
inverse P-Cygni profiles. More important, with two color-color
diagrams, (H-Ks, J-H) and (Ks-W1, H-Ks), of a collection of known
Herbig Ae/Be stars (HAeBes) and classical Ae/Be stars (CAeBes), we
propose an updated criterion to separate HAeBes from CAeBes. By the
criterion, we select 118 HAeBe candidates and 2636 CAeBe candidates
from the sample. We confirm 71 of the 118 HAeBes based on the data
from LAMOST (optical spectra) and WISE (photometry and images), 62 of
which are newly identified. The 71 identified HAeBes are compiled into
a specific catalog, and their SEDs and MIR images are also presented.
The distances of 76% confirmed HAeBes are further than 1kpc, which
enlarges the number of known HAeBes in further distance. Most of the
71 HAeBes are located in the Galactic disk while 6 of them have
|Zgal|>400pc. Four HAeBes show the forbidden emission lines of [FeII]
and [OI], in which J051425.20+411310.7 is a newly discovered B[e]. In
addition, four HAeBes having Spitzer IRS spectra all show PAH
features.
Description:
LAMOST is a reflecting Schmidt telescope located at the Xinglong
Station of the National Astronomical Observatory, China
(40°N,105°E), with a mean aperture of 4.3m and a field of view
of 5°. Until 2021 June, DR7 published more than 10 million
low-resolution spectra covering 3690-9100Å (R∼1800) and about
11 million single exposure medium-resolution spectra covering
4950-5350Å and 6300-6800Å (R∼7500).
The data we used include ∼500000 low-resolution spectra of O-, B-, A-,
or EM-type stars classified by the LAMOST 1D pipeline (Luo+ 2015, V/146).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 198 30023 Catalog of Hα emission-line stars
table3.dat 160 22 Velocities of stellar winds or accretion flows
table5.dat 115 15 Herbig Ae/Be stars (HAeBes) associated with
solar-nearby SFRs
tablea1.dat 110 72 71 confirmed HAeBes
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/360 : Gaia DR2 x AllWISE catalogue (Marton+, 2019)
VII/7 : Lynds' Catalogue of Dark Nebulae (LDN) (Lynds 1962)
VII/21 : Catalogue of Reflection Nebulae (Van den Bergh, 1966)
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)
J/A+AS/113/325 : Distance measurements of Lynds Nebulae (Hilton+, 1995)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
J/AJ/129/856 : Herbig Ae/Be stars in nearby OB assoc. (Hernandez+, 2005)
J/ApJ/653/657 : Spectroscopic obs. of Herbig Ae/Be stars (Manoj+, 2006)
J/ApJ/693/L81 : Extinction in star-forming regions (McClure, 2009)
J/ApJS/187/228 : Hα profiles of Be stars (Silaj+, 2010)
J/ApJS/201/11 : MIR spectral variability atlas of YSOs (Kospal+, 2012)
J/MNRAS/435/3058 : VIc phot. of IR-excess stars in NGC6611 (De Marchi+ 2013)
J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)
J/ApJS/221/26 : Radio obs. of Galactic WISE HII regions (Anderson+, 2015)
J/MNRAS/453/976 : Herbig Ae/Be X-shooter observations (Fairlamb+, 2015)
J/other/NewA/44.1 : IR photometric study of Herbig Ae/Be stars (Chen+, 2016)
J/ApJ/827/96 : WISE census of YSOs in Canis Major (Fischer+, 2016)
J/ApJS/234/33 : A GBT survey of large Gal. HII regions (Anderson+, 2018)
J/ApJS/238/4 : Algol-type binaries from CSSs (Papageorgiou+, 2018)
J/A+A/620/A128 : Gaia DR2 study of Herbig Ae/Be stars (Vioque+, 2018)
J/AJ/159/43 : Spectroscopically CVs from LAMOST. I. (Hou+, 2020)
J/A+A/638/A21 : New Herbig Ae/Be & classical Be stars cat. (Vioque+, 2020)
J/A+A/643/A122 : Active deep learning in large sp. surveys (Skoda+, 2020)
J/MNRAS/500/4849 : GALAH emission-line stars (Cotar+, 2021)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- LAMOST LAMOST source designation
21- 52 A32 --- Simbad Simbad identifier
54- 64 F11.7 deg RAdeg Right Ascension (J2000)
66- 75 F10.7 deg DEdeg [-8.4/69.4] Declination (J2000)
77-121 A45 --- SpName Spectrum FITS name
123-127 A5 --- Class LAMOST spectral type
129-136 F8.2 km/s cz [-1239.91/1245.17] LAMOST pipeline cz (1)
138-140 F3.1 --- HaType [1.1/3.2]? Hα type
142-166 A25 --- OType Object type from this work
168-194 A27 --- OTypelit Object type in literature (2)
196-196 A1 --- Ne [Y ] Nebular emission line exists?
198-198 A1 --- HII [KCQG ] Source in a known HII region? (3)
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Note (1): The radial velocity provided is the product of the redshift given
from the LAMOST pipeline and the speed of light (c*z).
Note (2): The result in literature including 4 classes (CV, Algol-type
binary, CAeBe, and HAeBe) from the following sources:
CV = Hou et al. (2020, J/AJ/159/43 ; 20 occurrences)
Algol-type binary = Budding+ (2004, J/A+A/417/263 and
Papageorgiou+ 2018, J/ApJS/238/4 ; 33 occurrences)
CAeBe = Neiner+ (2011AJ....142..149N 2011AJ....142..149N and Anusha+ 2021MNRAS.501.5927A 2021MNRAS.501.5927A ;
269 occurrences);
HAeBe = Vioque+ (2018, J/A+A/620/A128 and Neiner+ 2011AJ....142..149N 2011AJ....142..149N ;
13 occurrences).
Note (3): Star located in the projection of known HII regions provided
by Anderson+ (2014, J/ApJS/212/1) as follows:
K = known (2914 occurrences);
C = candidate (245 occurrences);
G = group (168 occurrences);
Q = radio-quiet (288 occurrences).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- LAMOST LAMOST source designation
21- 46 A26 --- Simbad Simbad identifier
48- 58 F11.7 deg RAdeg [21.3/323.2] Right Ascension (J2000)
60- 69 F10.7 deg DEdeg [-3.5/56.2] Declination (J2000)
71-115 A45 --- SpName FITS name of each spectrum
117-141 A25 --- OType Object type, this work
143-145 F3.1 --- HaType [3.1/3.2] Type of Hα emission-line profile
147-150 I4 km/s Vel [-720/1150] Terminal velocity (1)
152-155 I4 km/s MaxVel [-500/750] Maximum depth velocity (2)
157-160 I4 km/s PkVel [-200/310] Emission peak velocity (3)
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Note (1): The 'Terminal velocity' column is the extending terminal velocity of
blue- (red-) shifted absorption estimated from the P-Cygni or inverse
P-Cygni profiles in Hα band with photospheric absorption subtracted.
Note (2): The 'Maximum depth velocity' column is the maximum depth velocity of
blue- (red-) shifted absorption estimated from the P-Cygni or inverse
P-Cygni profiles in Hα band with photospheric absorption subtracted.
Note (3): The 'Emission peak velocity' column is the velocity of the
emission peak estimated from the P-Cygni or inverse P-Cygni profiles in
Hα band with photospheric absorption subtracted.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [9/65]? Sequential identifier,
matching Table A (1)
4- 22 A19 --- LAMOST LAMOST source designation
23- 23 A1 --- f_LAMOST [*] *=Known HAeBe
25- 47 A23 --- Simbad Simbad identifier
49- 57 F9.5 deg GLON [159.5/214.4] Galactic longitude of HAeBe
59- 67 F9.5 deg GLAT [-22.2/2] Galactic latitude of HAeBe
69- 74 F6.2 pc b_Dist [276/810] Lower distance value for HAeBe (2)
76- 81 F6.2 pc B_Dist [312/879] Upper distance value for HAeBe (2)
83- 89 A7 --- SFR Name, Star-forming region (3)
91- 93 I3 pc DistSFR [140/830] Distance from SFR to the Sun (3)
95-100 F6.2 deg GLONSFR [158/214] Galactic longitude of SFR (3)
102-104 F3.1 deg b_GLONSFR [1.5/9]? Angular size of SFR in GLON (±) (3)
106-111 F6.2 deg GLATSFR [-19.5/1] Galactic latitude of SFR (3)
113-115 F3.1 deg b_GLATSFR [1.5/7]? Angular size of SFR in GLAT (±) (3)
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Note (1): Sources without a value of Seq are the three candidates presented in
this work.
Note (2): Distance range from Bailer-Jones+ (2018, I/347)
Note (3): SFRs are from Carmona+ 2010A&A...517A..67C 2010A&A...517A..67C
(gathered from van den Bergh (1966, VII/21); de Zeeuw+ 1999, J/AJ/117/354
and Hilton & Lahulla (1995, J/A+AS/113/325)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/71]? Sequential identifier,
matching Table 5 (1)
4- 22 A19 --- LAMOST LAMOST source designation
23- 23 A1 --- f_LAMOST [*] *=Known HAeBe
25- 51 A27 --- Simbad Simbad identifier
53- 63 F11.7 deg RAdeg [7.9/323.2] Right Ascension (J2000)
65- 74 F10.7 deg DEdeg [-6.5/59] Declination (J2000)
76- 82 F7.2 pc b_Dist [298/7008] Lower distance value for source (2)
84- 91 F8.2 pc B_Dist [312/11924] Upper distance value for source (2)
93- 93 A1 --- MRS [Y] Medium-Resolution Source in LAMOST
95- 99 A5 --- Var Variable Type, AAVSO
101-104 F4.1 0.1nm FWHM [4/12.2] FWHM, Hα, Angstroms
106-110 A5 --- SpT Spectral type (3)
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Note (1): The last one is classified as a Herbig Ae candidate in our work
but is a known Herbig Ae star in literature and thus does not have a
value of Seq.
Note (2): Distance range from Bailer-Jones+ (2018, I/347).
Note (3): Spectral type provided by us based on the ELODIE library.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jun-2022