Eta Boötis

Eta Boötis (η Boo, η Boötis) is a star in the constellation Boötes. It has the traditional names Muphrid and Saak, and the Flamsteed designation 8 Boötis. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.

The name Muphrid is from the Arabic مفرد الرامح mufrid ar-rāmiħ "the (single) one of the lancer". In Chinese, 右攝提 (Yòu Niè Dī), meaning "the Right Conductor", refers to an asterism consisting of Eta Boötis, Tau Boötis and Upsilon Boötis. Consequently, Eta Boötis itself is known as 右攝提一 (Yòu Niè Dī yī, English: "the First Star of the Right Conductor"). In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Ramih al Ramih (رمح الرامحrumḥ al rāmiḥ), which was translated into Latin as Lancea Lanceator, possibly meaning the lance of the lancer.

This star is a subgiant that has begun the process of evolving from a main sequence star into a red giant. It has about 1.7 times the mass of the Sun and 2.7 times the Sun's radius. The estimated age of this star is about 2.7 billion years. Based on its spectra, Eta Boötis has a significant excess of elements heavier than helium. In fact the ratio of iron to hydrogen is considered close to the upper limit for dwarf stars in the galactic disk. The star is a suspected spectroscopic binary with a reported period of 494 days, but the companion was not confirmed through speckle interferometry. This measurement does not rule out a low mass stellar companion of spectral class M7.

Podcasts:

PLAYLIST TIME:

WHITE BOOTS

by: Stevie Ray Vaughan

That's my baby in the white boots....
That's my baby on the floor
That's my baby havin' some fun....
And yellin' more, more, more
That's my baby in the short skirt....
Woo, out of control
Ah she becomes another woman....
When she rocks and rolls
She's having a good time....
Goin' round and round
She's really rippin' it up....
You know she can't sit down, oh no
That's my baby lookin' so good....
You know I can't explain
How when she's dancing in the white boots....
It makes her go insane
She's having a good time....
Goin' round and round
She's really rippin' it up....
You know she can't sit down, oh no
That's my baby in the short skirt
With the white boots on
That's my baby in the white boots....
That's my baby on the floor
That's my baby havin' some fun....
And yellin' more, more, more
She's having a good time....
Goin' round and round
She's really rippin' it up....
You know she can't sit down, oh no
That's my baby in the short skirt
With the white boots on
With the white boots on
In the short skirt
With the white boots on
Can't explain....
You know I can't explain
How when she's dancing in the white boots....
It makes me go insane
White boots, white boots
White boots, white boots




×