Sh 2-170 lies in the direction of the Cas OB5 supershell
There is some confusion about the designation of the ionising star.
A 1995 paper concludes that the sole exciting star of Sh 2-170 is DM +63 2093
, an O8 V star of 31 solar masses. Avedisova agrees on the star but gives a slightly cooler O9 V class. Curiously, SIMBAD gives a G5 spectral class for this star.
Reed gives the name for the star in this location as LS I +64 11
, which SIMBAD lists as the O9.5 multiple star BD +63 2093p. A 2004 paper agrees on the BD +63 2093p designation and agrees with Avedisova on the O9 V class. This paper also says that BD +63 2093p is a member of the small open cluster Stock 18
and estimates 910 +/- 90 solar masses for the hydrogen gas in the nebula.
A wider view of this object can be found here
The sole exciting star of Sh 2-170 is DM +63 2093, an O8 V star of 31 solar masses. (curiously, SIMBAD says that this is the same as star as BD+63 2093, but lists this star as G5 - although multiple).[1
Sh 2-170 is in the vicinity of the Cas OB5 supershell.[2
A recent paper on Sh 2-170. [3
1. ^ Miville-Deschenes, Marc-Antoine, Joncas, Gilles, & Durand, Daniel (1995).
"The H II Region Sharpless 170: A Multiscale Analysis of the H alpha
Velocity Field", The Astrophysical Journal, Vol. 454, 316.
2. ^ Moór, A. & Kiss, Cs. (2003). "Multiwavelength Study of the Cas OB5
Supershell", Commmunications of the Konkoly Observatory Hungary, Vol. 103,
3. ^ Roger, R. S., McCutcheon, W. H., Purton, C. R., et al. (2004). "Sharpless
170 and the surrounding interstellar medium", Astronomy and Astrophysics,
Vol. 425, 553-567. [2004A&A...425..553R]