Hot Subdwarfs and a Carbon Star (Vitali)

Celestial hemisphere: Northern · Constellation: Lyra (Lyr) · Contains: NGC 6791

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Hot Subdwarfs and a Carbon Star

Revision title: Re-processed

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Hot Subdwarfs and a Carbon Star

Revision title: Re-processed

NGC6791 is an unusually old open cluster. Its age is estimated to be about 8 billion years. The bright star on the right is a cold carbon star U Lyrae, which has the surface temperature just about 2500K. The field is sprinkled with hot subdwarfs. The surface temperature of Cl* NGC 6791 KU B2 star at the bottom of the image is 40000K, according to Catalogue of hot subdwarf stars DR2 (Geier, 2020). Please see the annotated revision B.

I had to crop the image in order to remove stray light caused by two bright stars near the lower right corner of the field. Revision C is the unprocessed full field image.

Enjoy!
Vitali

Original
B
C
Final
D

B

Title: SIMBAD Annotations

Uploaded: ...

C

Title: Unprocessed full field

Uploaded: ...

D

Title: Re-processed

Description: AutoColor script for color calibration.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6426194
PixInsight job	SZ763FM6S3WGBW3TFY8OPQNBCY73ZY7S
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h20m52s.989
RA (top/left)	19h22m04s.159
RA (top/right)	19h20m34s.202
RA (bottom/right)	19h19m41s.756
RA (bottom/left)	19h21m11s.767

Dec (center)	+37°46′43″.50
Dec (top/left)	+37°44′09″.37
Dec (top/right)	+38°00′31″.99
Dec (bottom/right)	+37°49′15″.69
Dec (bottom/left)	+37°32′54″.90

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Hot Subdwarfs and a Carbon Star

Revision title: Re-processed

Hot Subdwarfs and a Carbon Star

Revision title: Re-processed

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Hot Subdwarfs and a Carbon Star

Revision title: Re-processed

Hot Subdwarfs and a Carbon Star

Revision title: Re-processed

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