Ամսագրի կամ հրապարակման վերնագիր:

Բյուրականի աստղադիտարանի հաղորդումներ: Երևանի աստղադիտարանի բյուլետեն = Сообщения Бюраканской обсерватории. Бюллетень ереванской Астрономической обсерватории = Contributions from the Burakan observatory. Bulletin of the Erevan astronomical observatory

Հրապարակման ամսաթիւ:

2022

Հատոր:

69

Համար:

2

ISSN:

2579-2276

Ծածկոյթ:

217-222

Ամփոփում:

Ultra-compact Hii (UC HII) regions are an important phase in the formation and early evolution of massive stars. The main objectives of this work are to study the stellar content associated with the G045.49+00.04 and G045.14+00.14 star-forming regions located in the GRSMC 45.46+0.05 molecular cloud at a distance of about 8 kpc. Both regions contain a number of UCHII regions. The main objective is to characterize the embedded young stellar objects (YSOs), such as their mass, evolutionary age and age spread, spatial distribution, luminosity function. We used near-, mid-, and far-infrared photometric data to identify and classify the YSOs. Their main parameters were determined by the spectral energy distribution (SED) fitting tool using radiation transfer models. Totally, we identified 2864 YSOs. We also constructed a colour-magnitude diagram to compare the parameters of stellar objects with the results of the radiative transfer models. The density distribution of the identified YSOs showed the presence of dense clusters in the UCHII regions. The parameters of YSOs in the IRAS clusters and non-cluster objects surrounding them show some differences. In general, the YSOs in these clusters have an evolutionary age larger than 106 years with an age spread of a few Myr. The clusters include several high- and intermediate-mass zero-age main sequence stellar objects. The small age spread suggests that the clusters may originate from a single triggering event.

Ձեւաչափ:

pdf

Նոյնացուցիչ:

oai:arar.sci.am:359479

Լեզու:

en

Գլխաւոր նշումը:

Communications of the Byurakan Astrophysical Observatory (ComBAO) is a peer-reviewed scientific journal, which publishes research in observational and theoretical astronomy/astrophysics and presents recent advances in these fields. It is being published by the NAS RA V. Ambartsumian Byurakan Astrophysical Observatory (BAO) in English in electronic form. The journal publishes original papers, review papers, brief reports, book reviews, special communications, observational and theoretical results in various fields of astronomy and related sciences, and some editorial notes, including anniversaries and obituaries. Under the heading “Legacy”, the renewed magazine will republish some old articles of high value in English. The heading “Guest articles” will bring to the attention of readers the articles of researchers who are not employees of BAO. ComBAO was founded in 1946 and regularly published in 1946-1990. However, the publication was interrupted because of the economic situation after the disintegration of the Soviet Union in 1991.

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