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What is the contradiction if a stellar spectrum exhibits both molecular lines and helium lines?
Wiki User
∙ 12y ago
Is this a trick question? Generally speaking helium lines only form at temperatures well above the cooler temperatures where molecular traits
can form (to be displayed spectroscopically). So, the implied contradiction is two opposing thermal conditions - hi temp vs low temp - or two traits, He vs say O2, which require two contradictory temp conditions. Anything else would generally require a rather exotic set of circumstances, as say with a mass ejection having outer coronal propoerties with temps high enough to be burning helium (in a thin shell), but spatially removed near the core of the event things have since cooled and might be showing a few molecular traits - a long slit cross sectional spectrum of the entire area might conceivably yield a merged spectrum showing seemingly contradictory (thermal) traits. Take stars c,d, and d in the Trapezium, for example. Each of these systems contains an O or B primary star with smaller K to M type companions; a long slit application which takes in the whole system may very well (well it will!) show seemingly contradictory traits. It is precisely mixes of such traits which define a spectroscopic binary. Yes?
Have I answered you question? I did the best I could! (laughing)
Wiki User
∙ 12y ago
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Current techniques can measure stellar motion to less than?
walking speed.
What is the nth term formula for stellar numbers?
Sn = 1 Sn = S(n-1)+12*(n-1), where S-0 (the first term) = 1 *This only works for stellar numbers of base 6
What is imaginary lines called?
On the earth (and planetary/stellar bodies) they are called latitudes and longitudes.
What is the general statement for the stellar number at stage Sn in terms of n?
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What are stellar numbers?
It is a figurate number, based on the number of dots or units that can fit in a centered hexagram or star shape.
What is the birthplace of stars called?
The birthplace of stars is called a stellar nursery or star-forming region. These regions are often found within interstellar clouds of gas and dust where gravitational forces cause these materials to collapse and form new stars.
How astronomers measure stellar temperatures?
Stellar temperature can be measured by analysing the spectrum of light that stars emit; shorter wavelengths correspond to higher temperatures.
Is a stellar nursery the same as a nebula?
A stellar nursery is usually called a molecular cloud. A nebula is a generic term for an interstellar cloud of dust, gas and plasma.
Which stellar spectral type has the largest number of prominent absorption lines in an optical spectrum?
M
The interstellar clouds called molecular clouds are .?
Molecular clouds are cold, dense regions in interstellar space made up of gas and dust where new stars can form. They are primarily composed of molecular hydrogen (H2) and are some of the coldest objects in the universe, with temperatures around -260 degrees Celsius. These clouds can be massive, often spanning tens to hundreds of light-years in size.
What is a stellar spectra?
Stellar spectra are graphs or visual representations of the intensity of light emitted by a star at different wavelengths. They provide information about the star's temperature, chemical composition, and motion towards or away from Earth. Studying stellar spectra is crucial for understanding the properties and evolution of stars.
How are absorption and emission lines produced in a stellar spectrum What information might absorption lines in the spectrum of a star reveal about a cloud of cool gas lying between us and the star?
Absorption lines are produced when elements in the outer layers of a star absorb specific wavelengths of light, leading to dark lines in the spectrum. These lines indicate the presence of certain chemical elements in the star's atmosphere. Absorption lines from a cool gas cloud between a star and Earth can reveal the composition, density, and temperature of the cloud, providing valuable information about the interstellar medium.
What are dark lines in a stellar spectrum called?
The dark lines are absorption spectrum, the energy absorbed by Atoms in the atmosphere of the star. ================================ Fraunhofer's spectral lines.
Which of the following might be evidence for an extrasolar planet?
Potential evidence for an extrasolar planet includes observing a star's wobble due to the gravitational pull of an orbiting planet, detecting a dip in a star's brightness as a planet passes in front of it (transit method), or directly imaging a planet near a star using advanced telescopic techniques.
What sentence can you use stellar in?
"Stellar" means "related to a star", so you can use it in expressions such as "stellar wind", "stellar atmosphere", "stellar fusion", etc.
How does a stellar spectroscope work?
Stellar spectroscopes work by collecting radiation from an astronomical object. Studying the electromagnetic spectrum can allow you to work out its temperature, chemical composition and other characteristics.
Why is the presence of large amounts of helium in the spectrum of a star generally considered a sign of age?
Stars begintheir lives burning hydrogen and converting it to helium. If there are large amounts of helium in a stellar spectrum, it would indicate that the star has been making helium for a long time - hence age.
