ISAAC spectrum of star from GRS 1915+105 binary system

Eso_eso0135b_1024

eso_eso0135b November 28th, 2001

Credit: ESO

The image shows one of the infrared ISAAC spectra of GRS 1915+105 . It is a K-band spectrum (in the 2.2 µm near-infrared spectral region) that reveals several previously unnoticed spectral features from the companion star that donates matter to the black hole. The presence and characteristics of these lines indicate that this donor star is a low-mass star.  Observing how the positions of the strong carbon monoxide bands (CO) shift with time has allowed the astronomers to measure the orbital motion of the donor star. Technical information: this image, with a K-band spectrum of GRS 1915+105, was obtained with ISAAC on the 8.2-m VLT ANTU telescope at Paranal. It is a sum of five spectra where each exposure is made up of eight integrations of 250 seconds each. The total exposure time is thus 167 minutes. With a one arc second slit, the spectral resolution is about 3000.

Provider: European Southern Observatory

Image Source: https://www.eso.org/public/images/eso0135b/

Curator: European Southern Observatory, Garching bei München, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

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Image Details

Image Type
Observation
Object Name
GRS 1915+105
Subject - Milky Way
Star > Type > Exotic

Color Mapping

  Telescope Spectral Band Wavelength
Grayscale VLT (ISAAC) Infrared (K) -
Eso_eso0135b_1280
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ID
eso0135b
Subject Category
B.3.2.6.1  
Subject Name
GRS 1915+105
Credits
ESO
Release Date
2001-11-28T00:00:00
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/eso0135b/
Type
Observation
Image Quality
Distance Notes
Facility
Very Large Telescope
Instrument
ISAAC
Color Assignment
Grayscale
Band
Infrared
Bandpass
K
Central Wavelength
Start Time
Integration Time
10140
Dataset ID
Notes
Coordinate Frame
Equinox
Reference Value
Reference Dimension
800.0, 426.0
Reference Pixel
Scale
Rotation
Coordinate System Projection:
Quality
FITS Header
Notes
Creator (Curator)
European Southern Observatory
URL
http://www.eso.org/
Name
Email
Telephone
Address
Karl-Schwarzschild-Strasse 2
City
Garching bei München
State/Province
Postal Code
D-85748
Country
Germany
Rights
Creative Commons Attribution 4.0 International License
Publisher
European Southern Observatory
Publisher ID
eso
Resource ID
eso0135b
Metadata Date
2010-02-26T12:56:32+01:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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