J/AJ/163/266 IGRINS & Gaia; star formation in Monoceros OB1 & R1 (Lim+, 2022)
A Gaia View on the Star Formation in the Monoceros OB1 and R1 Associations.
Lim B., Naze Y., Hong J., Yoon S.-Y., Lee J., Hwang N., Park B.-G.,
Lee J.-E.
<Astron. J., 163, 266 (2022)>
=2022AJ....163..266L 2022AJ....163..266L
ADC_Keywords: Star Forming Region; YSOs; Stars, O; Stars, B-type;
Spectra, infrared; Photometry, UVBGRI; Radial velocities
Keywords: Star formation ; Stellar kinematics ; Stellar associations ;
Stellar dynamics ; Open star clusters
Abstract:
Stellar kinematics provides the key to understanding the star
formation process. In this respect, we present a kinematic study of
the Monoceros OB1 (Mon OB1) and R1 (Mon R1) associations using the
recent Gaia data and radial velocities of stars derived from
high-resolution spectroscopy and the literature. A total of 728
members are selected using the criteria based on the intrinsic
properties of young stars, parallaxes, and proper motions. The spatial
distribution and kinematic properties of members show that these
associations have distinct substructures. In Mon OB1, we find one
northern group and two southern groups. Mon R1 is composed of three
small stellar groups that are spatially and kinematically distinct.
Some stars are found in a halo around these two associations. We
detect patterns of expansion for most stellar groups in the
associations. In addition, two stellar groups in Mon OB1 show the
signature of rotation, which provides an important constraint on
cluster formation. The star formation history of Mon OB1 is slightly
revised. Star formation first occurred in the southern region and
subsequently in the northern region. Recent star-forming events
ignited deeper into the southern region, while some stars are escaping
from Mon OB1, forming a halo. Mon R1 might have formed at the same
epoch as the formation of the northern group in Mon OB1. Given that
star formation is taking place on different scales along a large
arc-like structure, Mon OB1 and Mon R1 may be the results of
hierarchical star formation.
Description:
We obtained the high-resolution spectra of 14 YSO candidates in MonR1
using the Immersion GRating Infrared Spectrometer (IGRINS, R∼45000)
attached to the 8.2m Gemini South telescope on 2020 February 4, 5, 7,
9, 11, and 12.
Tobin+, 2015, J/AJ/149/119T published the RVel data of 695 stars
located in NGC2264. It is noted that the published RVel are actually
line-of-sight velocities at the local standard of rest, not
heliocentric RVel. We took the data and cross-matched them with the
Gaia catalog, leading to a total of 684 having Gaia counterparts.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 129 728 List of members
--------------------------------------------------------------------------------
See also:
B/simbad : Simbad objects catalogue (M.Wenger 2000)
B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009)
II/328 : AllWISE Data Release (Cutri+ 2013)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
VII/21 : Catalogue of Reflection Nebulae (Van den Bergh, 1966)
V/125 : Photometry and Spectroscopy for Luminous Stars (Reed 2005)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997)
J/AJ/123/1528 : UBV(RI)C and JHK photometry in NGC 2264 (Rebull+, 2002)
J/AJ/126/1916 : JHK photometry of young clusters near Sun (Porras+, 2003)
J/AJ/128/1684 : NGC 2264; VRIHα photometry (Sung+, 2004)
J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006)
J/ApJ/648/1090 : Radial velocities of NGC 2264 stars (Furesz+, 2006)
J/ApJS/175/277 : Submm-Continuum SCUBA detections (Di Francesco+, 2008)
J/ApJ/688/1142 : Star formation in W5; Spitzer observations (Koenig+, 2008)
J/AJ/135/441 : VRIHα photometry in NGC 2264 (Sung+, 2008)
J/AJ/138/963 : Rotation of NGC 2264 members (Baxter+, 2009)
J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)
J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009)
J/A+A/539/A74 : NGC1893 Chandra X-ray catalog (Caramazza+, 2012)
J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)
J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)
J/ApJ/787/107 : Spatial structure of young stellar clusters I. (Kuhn+, 2014)
J/AJ/149/127 : The SOS project. IV. NGC 1624 and NGC 1931 (Lim+, 2015)
J/AJ/149/119 : Radial velocities of stars in NGC 2264 (Tobin+, 2015)
J/ApJ/831/116 : Photometry & spectroscopy PMS stars in NGC 2264 (Lim+, 2016)
J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016)
J/MNRAS/477/1993 : NGC 1893 stars LSR velocities (Lim+, 2018)
J/A+A/609/A10 : NGC2264 structure and star formation history (Venuti+, 2018)
J/A+A/626/A17 : Young pop. in Vela-Puppis region (Cantat-Gaudin+, 2019)
J/ApJ/870/32 : Kinematics young star clusters & associations (Kuhn+, 2019)
J/A+A/631/A3 : G202.3+2.5 position-velocity cubes (Montillaud+, 2019)
J/ApJ/899/121 : 127 early type & pre-main-sequence stars in W4 (Lim+, 2020)
J/AJ/159/272 : Orion Nebula PMs with HST Treasury Program (Platais+, 2020)
J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)
J/AJ/162/56 : Radial velocity 240 YSOs with MMT/Hectochelle (Lim+, 2021)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Num [1/728] Sequence number
5- 6 I2 h RAh [6/6] Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- [+] Sign of the Declination (J2000)
18- 19 I2 deg DEd [8/10] Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000)
29- 34 F6.4 mas plx [1.01/1.96] Gaia EDR3 parallax (1)
36- 41 F6.4 mas e_plx [0.01/0.5] Uncertainty in plx
43- 48 F6.3 mas/yr pmRAcosDE [-4.55/0.1] Gaia EDR3 proper motion along
RA*cos(DE)
50- 54 F5.3 mas/yr e_pmRAcosDE [0.01/0.6] Uncertainty in pmRAcosDE
56- 61 F6.3 mas/yr pmDE [-8.28/-0.53] Gaia EDR3 proper motion along
DE
63- 67 F5.3 mas/yr e_pmDE [0.01/0.5] Uncertainty in pmDE
69- 75 F7.4 mag Gmag [7.15/19.5] Gaia EDR3 G band apparent
magnitude
77- 83 F7.4 mag BPmag [7.03/21.6] Gaia EDR3 Blue passband apparent
magnitude
85- 91 F7.4 mag RPmag [7.36/18] Gaia EDR3 Red passband apparent
magnitude
93- 99 F7.4 mag B-R [-0.34/4.07] Gaia EDR3 Blue-Red color
101-105 F5.2 km/s RVel [-7.56/12.24]? Local Standard of Rest
radial velocity (2)
107-110 F4.2 km/s e_RVel [0.01/5]? Uncertainty in RVel
112 A1 --- Type Member type (3)
114-120 A7 --- Region Region identifier; Halo, Mon OB1 or Mon R1
122-129 A8 --- Group Group identifier
--------------------------------------------------------------------------------
Note (1): We corrected for the zero-point offsets for the Gaia parallaxes
according to the recipe of Lindegren+, 2021A&A...649A...4L 2021A&A...649A...4L.
Note (2): The radial velocities were obtained from Tobin+, 2015, J/AJ/149/119T
and our observation.
Note (3): Types as follows:
E = O- or B-type stars obtained from the data bases of MK classification
(Wenger+, 2000A&AS..143....9W 2000A&AS..143....9W; Reed, 2003, V/125;
Mermilliod & Paunzen, 2003A&A...410..511M 2003A&A...410..511M; Skiff, 2009, B/mk;
Maiz Apellaniz+, 2013msao.confE.198M). (24 occurrences)
Y = young stellar objects or pre-main sequence members (704 occurrences)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 29-Sep-2022