Here's why:
* Surface Temperature: A-type stars have surface temperatures ranging from approximately 7,500 K to 10,000 K. Your description of 9,000 K falls right within this range.
* Luminosity: A-type stars typically have luminosities 5 to 20 times greater than our Sun's luminosity. The range you provided of 1 to 20 times greater includes this typical range, making it a good fit.
Examples of A-type stars:
* Sirius: The brightest star in our night sky, with a surface temperature of approximately 9,940 K and a luminosity of 25 times that of the Sun.
* Vega: A very bright star in the constellation Lyra, with a surface temperature of approximately 9,600 K and a luminosity of 37 times that of the Sun.
Keep in mind that there's a range of characteristics within the A-type classification, so the exact luminosity can vary.
