Fact Sheet on HMW 15

The star is a member of the extremely young cluster IC 348 that is in the constellation of Perseus and has a distance of about 300 pc, or 1200 light years.

Figure 1: A portion of an image of IC 348 obtained with the CCD camera attached to the 0.6 m Perkin telescope of the Van Vleck Observatory, on the campus of Wesleyan University in Middletown, CT. North is at the top and East to the left. This I-band image covers about 5 arc-minutes on a side. Many of the cluster members  can be seen.

Figure 2: The light curve of HMW 15 over eight years.

Figure 3. In addition to the actual data (as X's) we show the data reflected about the point JD=2451905.0 (as dots). It is clear that the light curve is remarkably symmetric about that date, although not perfectly so.

Identifiers:

Trullols & Jordi 108 (Trullols, E. & Jordi, C. 1997, A&A 324, 549)
Herbig 187 (Herbig, G. H. 1998, ApJ 497, 736)
HMW 15 (Herbst, W. Maley, J. A. & Williams, E. C. 2000, AJ 120, 349) Note, the position for the star given in Table 1 of this paper is incorrect.
Luhman  et al. 35 (Luhman, K. L., Rieke, G. H., Lada, C. J. & Lada, E.A. 1998, ApJ 508, 347)  and  (Luhman, Stauffer, Muench, Rieke, Lada, Bouvier & Lada, 2003, preprint)
CXOPZ 153 (X-ray source in Preibisch & Zinnecker 2001, AJ 122, 866)
CXOPZ J034439.2+320736

ICRS 2000.0 coordinates
03 44 39.31 +32 07 34.0 D
FK5 2000.0/2000.0 coordinates
03 44 39.31 +32 07 34.0
FK4 1950.0/1950.0 coordinates
03 41 30.98 +31 58 10.3
Galactic coordinates
160.53 -17.82

V = 15.82 (Trullols & Jordi), 15.90 (Herbig)
B-V=2.08 (Trullols & Jordi), 2.19 (Herbig)
U-B=1.48 (TJ)
V-I=2.80 (TJ), 2.87 (Herbig)
V-R=1.47 (TJ, Herbig)

J-H=0.96 (Luhman et al. 1998), 0.88 (2Mass)
H-K=0.40 (Luhman et al. 1998),  0.40 (2Mass)
K=9.90 (Luhman et al. 1998), 9.55 (2Mass)

Spectral type: G8 (Herbig 1998),G8-K4 or K3-K6(IR; Luhman 1998) This is the range of spectral  types reported for the star. H-alpha is in absorption according to Herbig.

Effective Temp: 4730  K (Luhman et al., 1998)
L_bol=2.07 solar luminosity  (Luhman et al. 1998)

Radius=2.15 solar radii (based on T_e and L_bol) as given above
Mass ~ 1 solar mass (VERY crude estimate based on location on HR diagram)
Age ~ 1-4 My, based on membership in IC 348