Observations explore the nature of infrared source IRAS 07253-2001

Utilizing the Caucasian Mountain Observatory (CMO), Russian astronomers have noticed a peculiar infrared supply designated IRAS 07253-2001. Outcomes of the observational marketing campaign, printed July 20 on the preprint server arXiv, reveal insights into the properties of this supply, shedding extra mild on its nature.

Situated about 32,500 light years away, IRAS 07253-2001 is an infrared supply first recognized greater than three a long time in the past. It’s a poorly studied supply and its true nature continues to be unknown. Some research have recommended that it could be a post-asymptotic big department (AGB) supergiant star about 54 instances bigger than the sun and surrounded by a dust shell with a radius of about 100,000 solar radii.

A crew of astronomers led by Natalia Ikonnikova of the Lomonosov Moscow State College, Russia, determined to take a more in-depth have a look at IRAS 07253-2001. They employed CMO’s 60-cm Ritchey-Cretien telescope to conduct photometric and spectroscopic observations of this supply. Their research was complemented by knowledge from the All-Sky Automated Survey for SuperNovae (ASAS-SN).

“We current the brand new multicolor UBV R_C I_C Y JHK photometry obtained with the telescopes of the Caucasian Mountain Observatory and analyze it along with the info acquired by the All-Sky Automated Survey for SuperNovae,” the researchers wrote within the paper.

The observations detected low-amplitude quasi-periodic brightness variability of IRAS 07253-2001, brought on by pulsations. The variability has a principal interval of about 73 days and extra durations of 68 and 70 days. This variability sample and pulsational durations are typical for post-AGB stars of F0–F8 spectral sorts.

Primarily based on the ASAS-SN and CMO knowledge, Ikonnikova’s crew additionally recognized a long-term brightness variability with a interval of roughly 1,800 days. The astronomers suppose that that is an orbital interval of IRAS 07253-2001, making it a binary system at a distance of some 1,500 mild years—subsequently a lot nearer than beforehand estimated.

The research detected forbidden emission traces radiated by a fuel envelope within the spectrum of IRAS 07253-2001, most definitely excited by the new star within the system. Furthermore, a variation of radial velocity with an amplitude of about 30 km/s was recognized, which additional helps the binary state of affairs.

The authors of the paper underlined that every one the collected knowledge point out that IRAS 07253-2001 is a pos-AGB supergiant with an effective temperature at a stage of 6,300 Ok, nevertheless its actual mass and chemical composition is but to be decided by future research.

“To acquire extra dependable stellar parameters and to estimate abundances within the ambiance a high-resolution spectroscopy mixed with a non-LTE [non-local thermodynamic equilibrium] method could be wanted,” the researchers concluded.

They added that the collected knowledge masking a large wavelength vary from 0.35 to 2.2 µm will probably be useful in modeling the spectral power distribution (SED) of IRAS 07253-2001 and figuring out the parameters of its dust shell.

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