| Full text | |
| Author(s): Show less - |
Santos-Silva, T.
[1]
;
Perottoni, H. D.
[1]
;
Almeida-Fernandes, F.
[1]
;
Gregorio-Hetem, J.
[1]
;
Jatenco-Pereira, V
[1]
;
Mendes de Oliveira, C.
[1]
;
Montmerle, T.
[2]
;
Bica, E.
[3]
;
Bonatto, C.
[3]
;
Monteiro, H.
[4]
;
Dias, W. S.
[4]
;
Barbosa, C. E.
[1]
;
Fernandes, B.
[1]
;
Galli, P. A. B.
[5]
;
Borges Fernandes, M.
[6]
;
Kanaan, A.
[7]
;
Ribeiro, T.
[8]
;
Schoenell, W.
[9]
Total Authors: 18
|
| Affiliation: | [1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508090 Sao Paulo, SP - Brazil
[2] Inst Astrophys Paris, F-75014 Paris - France
[3] Univ Fed Rio Grande do Sul, Dept Astron, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil
[4] Univ Fed Itajuba, Inst Fis & Quim, Av BPS 1303 Pinheirinho, BR-37500903 Itajuba, MG - Brazil
[5] Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N, Allee Geoffroy St Hillaire, F-33615 Pessac - France
[6] Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[7] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC - Brazil
[8] Natl Opt Astron Observ, POB 26732, Tucson, AZ 85726 - USA
[9] GMTO Corp, 465 N Halstead St, Suite 250, Pasadena, CA 91107 - USA
Total Affiliations: 9
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 508, n. 1, p. 1033-1055, NOV 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Canis Major OB1 (CMa OB1) is a Galactic stellar association with a very intriguing star-formation scenario. There are more than two dozen known star clusters in its line of sight, but it is not clear which ones are physically associated with CMa OB1. We use a clustering code that employs five-dimensional data from the Gaia DR2 catalogue to identify physical groups and obtain their astrometric parameters and, in addition, we use two different isochrone-fitting methods to estimate the ages of these groups. We find 15 stellar groups with distances between 570 and 1650 pc, including 10 previously known and five new open cluster candidates. Four groups, precisely the youngest ones (< 20 Myr), CMa05, CMa06, CMa07, and CMa08, are confirmed to be part of CMa OB 1. We find that CMa08, a new cluster candidate, may be the progenitor cluster of runaway stars. CMa06 coincides with the well-studied CMa R1 star-forming region. While CMa06 is still forming stars, due to the remaining material of the molecular cloud associated with the Sh 2-262 nebula, CMa05, CMa07, and CMa08 seem to be in more evolved stages of evolution, with no recent star-forming activity. The properties of these CMa OBI physical groups fit well in a monolithic scenario of star formation, with a common formation mechanism, and having suffered multiple episodes of star formation. This suggests that the hierarchical model alone, which explains the populations of other parts of the same association, is not sufficient to explain its whole formation history. (AU) | |
| FAPESP's process: | 18/20977-2 - Identification of giant stars for mapping our Galaxy in the S-PLUS survey |
| Grantee: | Felipe de Almeida Fernandes |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/18100-4 - Stellar populations in the Milky Way: bulge, halo, disk and star forming regions; instrumentation for high resolution spectroscopy |
| Grantee: | Beatriz Leonor Silveira Barbuy |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/21250-9 - Identification of bright ultra-metal-poor stars from Multi-Band photometry and spectroscopic follow-up |
| Grantee: | Hélio Dotto Perottoni |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 15/24946-6 - Study of star formation regions with J-PAS |
| Grantee: | Vera Jatenco Silva Pereira |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/06822-6 - Multi-band study of protostellar objects in the star forming region CMa R1 |
| Grantee: | Thais dos Santos Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |