Kavli Affiliate: Subo Dong
| First 5 Authors: Sydney Petz, Sydney Petz, , ,
| Summary:
We search a sample of 5,685,060 isolated sources in the All Sky Automated
Survey for SuperNovae (ASAS-SN) with 14.5<g<15 mag for slowly varying sources
with brightness changes larger than ~0.03 mag/year over 10 years. We find 426
slowly-varying systems. Of these systems, 200 are identified as variables for
the first time, 226 are previously classified as variables, and we find equal
numbers of sources becoming brighter and fainter. Previously classified systems
were mostly identified as semi-regular variables (SR), slow irregular variables
(L), or unknown (MISC or VAR), as long time scale variability does not fit into
a standard class. Much like Petz & Kochanek 2025, the sources are scattered
across the color magnitude diagram and can be placed into 5 groups that exhibit
distinct behaviors. There are also six AGN. There are 262 candidates (~62
percent) that also show shorter time scale periodic variability, mostly with
periods longer than 10 days. The variability of 66 of these candidates may be
related to dust. Combining the new slow variable candidates with the candidates
from Petz & Kochanek 2025, we have found a total of 1206 slow variables.
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