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The star HD 93250 in the Carina Nebula is a bright O-type star. It has a reported apparent magnitude in the V band of my = 7.41 and V band absolute magnitude of My = -6.14. Using these values calculate the distance to HD 93250 in parsec. The distance to HD 93250 has been measured by other means as 2350 pc. Compare your calculated value of the distance with the measured value, and give a possible explanation for any difference. Calculate the value of the interstellar extinction in the V band Ay that would account for the difference in the distances. The parameter E(BV) = AB - Ay, where AB and Ay are the extinctions in the B and V bands, is often used to characterize interstellar extinction. For the star HD 93250 the value E(BV) 0.48 has been measured. Given the above value of E(B-V) for HD 93250, calculate the extinction in the B band, and explain why the parameter E(B-V) is often called the "reddening." The B band apparent magnitude of HD 93250 is mg = 8.12. Calculate the B band absolute magnitude of MB, and hence the colour index B-V (i.e., MB - My). Briefly comment on how this is consistent with HD 93250 being an O-type star.

The star HD 93250 in the Carina Nebula is a bright O-type star. It has a reported apparent magnitude in the V band of my = 7.41 and V band absolute magnitude of My = -6.14. Using these values calculate the distance to HD 93250 in parsec. The distance to HD 93250 has been measured by other means as 2350 pc. Compare your calculated value of the distance with the measured value, and give a possible explanation for any difference. Calculate the value of the interstellar extinction in the V band Ay that would account for the difference in the distances. The parameter E(BV) = AB - Ay, where AB and Ay are the extinctions in the B and V bands, is often used to characterize interstellar extinction. For the star HD 93250 the value E(BV) 0.48 has been measured. Given the above value of E(B-V) for HD 93250, calculate the extinction in the B band, and explain why the parameter E(B-V) is often called the "reddening." The B band apparent magnitude of HD 93250 is mg = 8.12. Calculate the B band absolute magnitude of MB, and hence the colour index B-V (i.e., MB - My). Briefly comment on how this is consistent with HD 93250 being an O-type star.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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The star HD 93250 in the Carina Nebula is a bright O-type star. has a reported apparent magnitude in the V band of my = 7.41 and V band absolute magnitude of My = -6.14. Using these values calculate the distance to HD 93250 in parsec. The distance to HD 93250 has been measured by other means as 2350 pc. Compare your calculated value of the distance with the measured value, and give a possible explanation for any difference. Calculate the value of the interstellar extinction in the V band Ay that would account for the difference in the distances. The parameter E(BV) = AB - Ay, where AB and Ay are the extinctions in the B and V bands, is often used to characterize interstellar extinction. For the star HD 93250 the value E(BV) 0.48 has been measured. Given the above value of E(BV) for HD 93250, calculate the extinction in the B band, and explain why the parameter E(B-V) is often called the "reddening." The B band apparent magnitude of HD 93250 is mg = 8.12. Calculate the B band absolute magnitude of MB, and hence the colour index B-V (i.e., MB - My). Briefly comment on how this is consistent with HD 93250 being an O-type star.
Transcribed Image Text:The star HD 93250 in the Carina Nebula is a bright O-type star. has a reported apparent magnitude in the V band of my = 7.41 and V band absolute magnitude of My = -6.14. Using these values calculate the distance to HD 93250 in parsec. The distance to HD 93250 has been measured by other means as 2350 pc. Compare your calculated value of the distance with the measured value, and give a possible explanation for any difference. Calculate the value of the interstellar extinction in the V band Ay that would account for the difference in the distances. The parameter E(BV) = AB - Ay, where AB and Ay are the extinctions in the B and V bands, is often used to characterize interstellar extinction. For the star HD 93250 the value E(BV) 0.48 has been measured. Given the above value of E(BV) for HD 93250, calculate the extinction in the B band, and explain why the parameter E(B-V) is often called the "reddening." The B band apparent magnitude of HD 93250 is mg = 8.12. Calculate the B band absolute magnitude of MB, and hence the colour index B-V (i.e., MB - My). Briefly comment on how this is consistent with HD 93250 being an O-type star.
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