Multiwavelength and astrometric study of the DBS 89−90−91 embedded clusters region

CORTI, M.; G.L. BAUME; R. B. ORELLANA; L. A. SUAD

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2023

0004-6361

Aims. Our main targets were to improve the understanding of the main properties of G316.8−0.1 (IRAS 14416−5937) radio source where the DBS 89−90−91 embedded clusters are located, to identify the stellar population present in this region, and to study the interaction of these stars with the interstellar medium.Methods. We analyzed some characteristics of the G316.8−0.1 radio source consulting the SUMSS to study the radio continuum emission at 843 MHz and the H I SGPS at 21 cm. We also used photometric data at the JHK bands in the region of DBS 89−90−91 clusters obtained from the VVV survey and supplemented with 2MASS catalogue. The investigation of possible stars associated with the H II region was complemented with the astrometric analysis using the Gaia Early Data Release 3. To study the young stellar objects we consulted the mid-infrared photometric information from WISE, Spitzer−GLIMPSE Surveys, and MSX point source catalog.Results. The photometric and astrometric research carried out in the IRAS 14416−5937 region allowed us to improve the knowledge about the DBS 89−90−91 embedded clusters and their interaction with the interstellar medium. In the case of DBS 89 cluster, we identified 9 astrophotometric candidate members and 19 photometric candidate members, whereas for DBS 90−91 clusters we found 18 candidate photometric members. We obtained a distance value for DBS 89 linked to G316.8−0.1 radio source of 2.9 ± 0.5 kpc. We also investigated 12 Class I YSOc, 35 Class II YSOc, 2 MYSOc and 1 CHII region distributed throughout the IRAS 14416−5937 region.Our analysis revealed that the G316.8−0.1 radio source is optically thin at frequencies ≥ 0.56 GHz. The H II regions G316.8−0.1−A and G316.8−0.1−B have similar radii and ionized hydrogen masses of ∼ 0.5 pc and ∼ 35 M , respectively. The ionization parameter computed with the younger spectral types of adopted members of DBS 89 and DBS 90−91 clusters, shows that they are able to generate the H II regions. The flux density of G316.8−0.1−B H II region is lower than the flux density of G316.8−0.1−A H II region.Conclusions. A photometric and astrometric research looking for the members of the DBS 89-90-91 embedded clusters has been carried out. We could identify the earliest stars of the clusters as the main exciting sources of the G316.8-0.1 radio source and we have also estimated the main physical parameters of this source. We improve the knowledge of the stellar components present in Sagittarius-Carina arm of our Galaxy and its interaction with the interstellar medium.