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 ամսաթիվ:

2025

Հատոր:

72

Համար:

2

ISSN:

2579-2276

Ծածկույթ:

381-385

Ամփոփում:

Asymptotic Giant Branch (AGB) stars and Long-Period Variables (LPVs) represent the final evolutionary stages of low- to intermediate-mass (0.8–8 M⊙) stars and play a crucial role in enriching the interstellar medium (ISM) with metals and dust, thereby influencing the chemical evolution of galaxies. In this study, AGB stars and LPVs in the dwarf irregular galaxy NGC 6822 were investigated using publicly available multi-wavelength photometric data spanning the near- to mid-infrared regime, including observations from JWST, Spitzer, and UKIRT. Candidate AGBs and LPVs were identified through crossmatching with available online catalogs, and a consolidated catalog of their multi-band photometry was compiled. The spectral energy distributions (SEDs) of these sources were modeled using the DUSTY and SEDust codes to derive mass-loss rates and other dust-related parameters. Both oxygen-rich (O-type) and carbon-rich (C-type) AGB and LPV populations were analyzed, and their combined contribution to the chemical enrichment of NGC 6822 was quantified, yielding a total mass-loss rate of 2.4 × 10−4 M⊙ yr−1 for the modeled sample. Correlations between key parameters, such as optical depth and bolometric correction, were further examined to estimate mass-loss rates for AGBs and LPVs not modeled due to incomplete photometric coverage.

Ձևաչափ:

pdf

Նույնացուցիչ:

oai:arar.sci.am:426419

Գլխավոր նշում:

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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