Utilizing the Nanshan Large Discipline Telescope (NOWT), astronomers from China noticed the open cluster NGC 2355 and its surrounding area, searching for variable stars. They found 72 new variants on this area. The end result was reported in a paper revealed June 14 on arXiv.org.
Star clusters provide wonderful alternatives to check stellar evolution, as they’re teams of stars with comparable traits, corresponding to age, distance, and preliminary composition. Specifically, astronomers typically seek for variable stars in younger clusters, which could possibly be crucial to advancing the understanding of pre-main sequence (PMS) stars, and thus the preliminary phases of stellar evolution.
Not too long ago, a staff of astronomers led by Hong Wang from the Xinjiang Astronomical Observatory in Xinjiang, China, carried out an in depth seek for variable stars in NGC 2355 utilizing the NOWT CCD digital camera. Positioned about 5,400 light-years away, NGC 2355 is an open cluster within the constellation of Gemini estimated to be 900 million years outdated. To date, only some variants of this group have been investigated.
“We studied variable stars in the field surrounding NGC 2355 based on time-series optical observation data. More than 3,000 CCD frames in the V-band spanning 13 nights were obtained using the 1-meter Nanshan Wide-field Telescope,” the researchers wrote within the paper.
In all, Wang’s staff found 88 variable stars from 13 nights of optical observations. It seems that 72 of the 88 stars are new variables, whereas the remainder are identified variables reported by earlier observations.
The researchers categorized the celebrities from the pattern into differing kinds based mostly on their gentle curves and derived key parameters. Lastly, of all the celebrities reported within the paper, 52 are pulsars, 26 are binary eclipses, and 4 are labeled as rotating variables. The remaining six are variable stars of an not noticeable sort.
“For those variable stars for which a type has not been identified, we may need more observations later to identify and classify these unknown variable stars,” the astronomers wrote.
Of the 52 pulsars, 38 are labeled as Delta Scuti variables, 9 as RR Lyraes, three as Gamma Doradus variables, and two as Cepheid-type I variable stars. In terms of 26 eclipse diodes, 11 of them are of the EW sort, 9 are of the EA sort and the remainder are of the EB sort.
The researchers observe that 4 variable stars reported within the paper are members of NGC 2355, along with 11 beforehand identified variables labeled as cluster members by a 2018 research. They’re situated within the cluster’s outer area and show inhomogeneities at house areas. and kinematic traits with the members of the block. As well as, the research authors discovered that NGC 2355 has a mineral content material of roughly -0.07 Dix and a redness of 0.24.
Almost a dozen new variable stars have been found in and across the open cluster NGC 1912.
Hong Wang et al, Trying to find variable stars in open cluster NGC 2355 and the encircling space. arXiv: 2206.06569v1 [astro-ph.SR]arxiv.org/abs/2206.06569
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