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J/AZh/87/853     Stellar groups of Orion's Sword region   (Vereshchangin+, 2010)

Stellar groups and clusters in the region of Orion's Sword. Vereshchangin S.V., Chupina N.V. <Astron. Zh. 87, 853 (2010)> =2010AZh....87..853V =2010ARep...54..784V
ADC_Keywords: Nebulae ; Proper motions Abstract: The region of Orion's Sword with coordinates RA=83.79°, DE=-5.20° and a size of 1.0°x2.5° is analyzed. We compiled a master catalog of stars observed in the optical, containing positions, proper motions, and UBV photometry for 1634 stars. Using the nearest-neighbor-distance technique, we subdivided the region into stellar groups with different numbers of members. The positions of five groups coincide with known clusters, and two groups coincide with aggregates of stars with Hα emission. We have identified groups with low membership that are moving away from the system. We also considered the kinematic structure of the groups using the AD-diagram method we developed earlier. Most of the stellar clusters and groups display similar kinematics, with the exception of the group OMC-2, which is moving toward its own apex. We also confirmed the existence of the kinematic star group 189 discovered earlier; its position is close to the cluster NGC 1977, and it is probably a component of its corona. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 146 73 Stellar groups identified in the Orion's Sword region
See also: J/AZh/88/143 : ORICAT, Stars in Orion Great Nebula (Vereshchagin+, 2011) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Group Group name (1) 11- 15 I5 --- Oricat Oricat number, Cat. J/AZh/88/143 18- 22 I5 --- HIP ? HIP number 24- 33 A10 --- SpType MK spectral type 35- 39 F5.2 mag Bmag B magnitude 41- 45 F5.2 mag B-V ? B-V colour index 47- 50 F4.1 mas/yr pmx ? Proper motion along X 52- 55 F4.1 mas/yr pmy ? Proper motion along Y 57- 59 F3.1 mas/yr e_pmx ? rms uncertainty on pmx 61- 63 F3.1 mas/yr e_pmy ? rms uncertainty on pmy 65- 66 I2 % PT ? Membership Probability according to Tian et al. (1996, Cat. J/A+AS/118/503) 68- 69 I2 % PM ? Membership Probability according to McNamara et al., 1989AJ.....97.1427M 71-146 A76 --- Notes Notes
Note (1): Main data for clusters in the Orion's Sword region ------------------------------------------------------------ Name(s) RA DE RV d r deg deg km/s arcmin pc ------------------------------------------------------------ NGC 1981 Upper Sword Walker 1 83.79 -4.42 28 28 400 NGC 1977 Walker 2 83.83 -4.82 25 25 500 OMC-2 Walker 3 83.79 -5.15 Trapezium NGC 1976 Walker 4 83.84 -5.37 23 48 450 NGC 1980 Lower Sword Walker 5 83.84 -5.92 21 14 550 Group D 83.75 -5.73 ----------------------------------------------------- Group 189 (in the stellar region occupied by NGC 1977) -----------------------------------------------------
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Sep-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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