A Cluster of Class I/f/II YSOs Discovered Near the Cepheid SU Cas

TL;DR

This study identifies and characterizes a young stellar object cluster near the Cepheid SU Cas, revealing its structure, composition, and the distribution of different classes of YSOs using infrared data.

Contribution

It provides the first detailed analysis of a YSO cluster in the vicinity of SU Cas, highlighting its non-spherical shape and the distribution of YSO classes based on combined WISE and 2MASS data.

Findings

Cluster exhibits non-spherical symmetry with 3x6 arcminute size.

Distribution of YSO classes varies with distance from the center.

Approximately 50% of class I sources within 3' are identified solely by WISE.

Abstract

Preliminary constraints are placed on a cluster of YSOs (J2000 02:54:31.4 +69:20:32.5) discovered in the field of the classical Cepheid SU Cas. WISE 3.4, 4.6, 12, and 22 um images reveal that the cluster deviates from spherical symmetry and exhibits an apparent diameter of 3x6'. SEDs constructed using 2MASS Ks (2.2 um) and WISE photometry indicate that 19 (36%) class I, 21 (40%) class f, and 13 (25%) class II objects lie r<3' from the cluster center. Conversely, 11 (18%) class I, 13 (21%) class f, and 37 (61%) class II objects were detected for r>3'. Approximately 50% of the class I sources within r<3' were classified solely using WISE photometry owing to the absence of detections by 2MASS.