Thus Algol became one of the first known spectroscopic binaries.

Both bright stars are spectroscopic binaries and have at least one closer companion.

He worked in spectroscopy and discovered a number of spectroscopic binaries.

Some spectroscopic binaries have an orbit that is edge-on to Earth.

Binary stars which are both visual and spectroscopic binaries also can have their distance estimated by similar means.

As the spectra of these stars vary due to the Doppler effect, they are called spectroscopic binaries.

However, in each case the companion star could not be resolved using a telescope, and so these double-star systems were designated spectroscopic binaries.

Spectroscopic binaries can be found by observing doppler shifts in the spectrum of the star and its close companion.

Photoelectric analysis of lunar occultations have also discovered some stars to be very close visual or spectroscopic binaries.

Such stars are known as single-lined spectroscopic binaries ("SB1").

He specialized in the study of stellar evolution and in the identification of spectroscopic binaries.

After it was determined to be a visual binary, Mizar's components were found to be spectroscopic binaries themselves.

He extensively studied spectroscopic binaries.

Prior to this analysis, another possible explanation of previous Doppler shift analysis included face-on spectroscopic binaries.

Frost's research focused on the determination of radial velocity using stellar spectroscopy and spectroscopic binaries.

Omicron Andromedae is a binary star, whose two components are both spectroscopic binaries themselves, making a four-star system.

Some spectroscopic binaries cannot be visually resolved and are discovered by studying the spectral lines of the suspect system over a long period of time.

He worked with the astrophysics staff, measuring the radial velocity of stars and determining the orbits of spectroscopic binaries.

He was the first successfully to determine radial velocities of stars photographically and as a result he discovered the spectroscopic binaries.

He measured radial velocities and studied spectroscopic binaries, and performed the first detailed analysis of galactic structure.

Two of these stars were themselves found to be spectroscopic binaries in 1998, resulting in a total of six known stars in the system.

Double and multiple stars are identified and visual binaries are differentiated from spectroscopic binaries.

Any binary star can belong to several of these classes; for example, several spectroscopic binaries are also eclipsing binaries.

In some spectroscopic binaries, spectral lines from both stars are visible and the lines are alternately double and single.

Binary stars that are both visual and spectroscopic binaries are rare, and are a precious source of valuable information when found.